Lance De Long | University of Kentucky College of Arts & Sciences

Lance De Long

Professor, APS Fellow

Professor of Physics, University of Kentucky, 2001- present

Associate Director, University of Kentucky Center for Advanced Materials, 2010 - present

Faculty Associate, Advanced Science and Technology Commercialization Center, University of Kentucky, 1994-present

Member, Users' Group, Oak Ridge National Laboratory, 1983-90, 2002 - present

Visiting Scholar, Physics Dept., University of California, San Diego, 01/02 - 07/02

Technical Consultant, LevTech, Inc., 2001-2007

Co-Founder and Chief Technology Officer, LevTech, Inc., 2000-2001

Program Director for Low Temperature Physics, Division of Materials Research, National Science Foundation, 1989

Consulting Expert, Low Temperature Physics Program, National Science Foundation, 09/88 - 01/89

Faculty Research Participant, Argonne National Laboratory, 1986-89

Scientist in Residence, Materials Science and Technology Division, Argonne National Laboratory, 1985-86 (Sabbatical Leave)

Research Associate, Ames Laboratory, 1984-94.

Associate Professor of Physics with Tenure, University of Kentucky, 1983-2001

Associate Member of the Graduate Faculty, University of Kentucky, 1981; appointed Full Member, 1983

Assistant Professor of Physics, University of Kentucky, 1979-83

Assistant Professor of Physics, University of Virginia, 1977-79

Contact Information

lance.delong@uky.edu

CP101, CP158 (Lab), CP75 (Lab), A041/A045 (ASTeCC Lab)

859-257-4775, 859-257-8883 (Lab), 859-218-6526 (ASTeCC)

Education

1964: Graduated from Littleton High School, Littleton, Colorado 1968: B.A. in Physics, Mathematics Minor, University of Colorado, Boulder, Colorado 1969: M.S. in Physics, University of California, San Diego, La Jolla, CA 1975: Ph.C. in Physics, University of California, San Diego, La Jolla, CA 1977: Ph.D. in Physics, University of California, San Diego, La Jolla, CA
Scholarships: Colorado University Grant: Fall, 1966; Spring, Summer, Fall, 1967, Spring, 1968 National Science Foundation Summer Traineeship: University of Colorado, Summer, 1966 California Regents' Graduate Fellow: University of California, San Diego, (four academic years, 1968-1972) Earle C. Anthony Scholarship: University of California, San Diego, (academic year, 1973-1974)

Research Interests

Condensed Matter Physics

Affiliations

Physics & Astronomy
CAM
Condensed Matter Physics (Experimental)
American Physical Society (Division of Condensed Matter Physics, Topical Group on Magnetism); Neutron Scattering Society of America, IEEE Magnetics Society

Curriculum Vitae (CV)
http://www.pa.uky.edu/condmat/

Research

Overview of Research Interests:

Experimental properties of superconducting and magnetic properties of materials are carried out at low temperatures, high pressures and high magnetic fields. Materials under study include rare earth, actinide and transition metal alloys and compounds, organic conductors and high temperature superconductors. Phenomena studied include heavy fermion and non-Fermi liquid effects, anomalous upper critical magnetic fields and "peak effect" in the magnetization of superconductors, highly anisotropic actinide compounds exhibiting metamagnetism, weak ferromagnetism or spin density wave states. A second group of materials includes various heavy transition element (e.g., Ru, Ir, Rh) oxides that exhibit high temperature ferromagnetism in a semiconducting state, and competition between strong spin-orbit, crystal field and coulomb interactions. A third group of materials under study include superconducting thin films patterned with lattices of artificial pinning centers such as antidots (holes), patterned ferromagnetic thin films, and ferromagnetic/ superconducting heterostructures. Associated phenomena studied include novel equilibrium magnetic vortex phases and the nonlinear magnetic response of the vortex phases to electromagnetic drives, nonlinear superfluid hydrodynamics and chaotic behavior of the superconducting mixed state. A third area of research involves ferromagnetic metamaterials whose domain walls and excitations can be systematically controlled via nanoscale patterning. A fourth area of research involves development of superconducting levitation technologies for applications in bioreactors and stirrers for biopharmaceutical, biomedical and agricultural processes.

Honors and Awards:

Phi Epsilon Phi Scholarship-Leadership Honorary, University of Colorado, Academic Year 1965-1966

Sigma Pi Sigma National Physics Honor Society, Elected to University of Colorado Chapter, 1967

Fellow of the American Physical Society, Division of Condensed Matter Physics, 2006: “For his contributions to the understanding of magnetic properties and interactions in superconducting and strongly correlated metallic crystals and films”

Outstanding Referee (Charter Member) for Journals of the American Physical Society, February 15, 2008

U.S. Patent Award: “Novel Class of Ferromagnetic Semiconductors”, Larysa V. Shlyk (Inventor), Lance E. De Long, Sergiy A. Kryukov, Robert Niewa and Barbara Schüpp-Niewa (Co-Inventors), U.S. Patent Application Serial No. 12/062,076, filed April 3, 2008. U. S. Patent 8,357,309 issued January 22, 2013.

Selected Publications:

Editorships

1. "Proceedings of the Seventeenth Rare Earth Research Conference, Hamilton, Ontario, June 9-12, 1986", published as Vols. 126 and 127 of The Journal of the Less-Common Metals (Elsevier North-Holland, Amsterdam, 1987), H. B. Silber, L. R. Morss and L. E. De Long, Editors.

2. "Proceedings of the Eighteenth Rare Earth Research Conference, Lake Geneva, WI, September 12-16, 1988", published as Vols. 148 and 149 of The Journal of the Less- Common Metals (Elsevier North-Holland, Amsterdam, 1989), H. B. Silber, L. R. Morss and L. E. De Long, Editors.

3. "Proceedings of the 20th Rare Earth Research Conference, Monterey, California, September 12-17, 1993", published as volumes of The Journal of Alloys and Compounds (Elsevier North-Holland, Amsterdam, 1994), L. R. Morss, M. F. Reid, H. B. Silber and L. E. De Long, Editors.

4. "Proceedings of the 21st Rare Earth Research Conference, Duluth, Minnesota, July 7-12, 1996", published as volumes of The Journal of Alloys and Compounds (Elsevier North- Holland, Amsterdam, 1996), L. R. Morss, H. B. Silber, L. E. De Long, and M. F. Reid, Editors.

5. Acting Divisional Associate Editor, Condensed Matter Physics, Physical Review Letters, 2001.

6. Frontiers of 4d- and 5d-Transition Metal Oxides, Edited by Gang Cao and Lance E. De Long (Singapore, World Scientific Publishing, 2013; ISBN 978-981-4374-85-9). This volume is a compendium of topical reviews covering physical properties of novel 4d- and 5d-transition element oxides by several expert contributors to recent research literature.

Journal Publications

1. "Continuously Operating ⁴He Evaporation Refrigerator", L. E. DeLong, O. G. Symko and J. C. Wheatley, Rev. Sci. Inst. 42, 147 (1971).

73. "Anomalous Vortex Dynamics in k-(ET)₂Cu[N(CN)₂]Br: Evidence for Field-Induced Magnetic Order and Unconventional Superconductivity", U. G. L. Lahaise, Qun Chen, L. E. De Long, C. P. Brock, H. H. Wang, K. D. Carlson, J. A. Schlueter and J. M. Williams, Phys. Rev. B (Rapid Commun.) 51, 3301 (1995-I).

76. "High-Sensitivity Vibrating Reed Studies of Superconductors", L. E. De Long, J. Childers, A. Olinger, Jr., Q. Chen, J.-C. Hou, U. Lahaise, J. Zhang, D. G. Hinks, P. Canfield, R. Schweinfurth, D. Van Harlingen and M. Norton, Physica B 223&224, 22 (1996).

77. "Nonlinear Dynamics of Magnetic Vortices in Single-Crystal and Ion-Damaged NbSe₂", Junqing Zhang, L. E. De Long, V. Majidi and R. C. Budhani, Phys. Rev. B (Rapid Commun.) 53, R8851 (1996).

78. “Supermatching Vortex Phases in Superconducting Thin Films with Antidot Lattices”, V. V. Metlushko, L. E. De Long, M. Baert, E. Rosseel, M. J. Van Bael, K. Temst, V. V. Moshchalkov and Y. Bruynseraede, Europhys. Lett. 41, 333 (1998).

81. “Non-Linear Flux Line Dynamics in Vanadium Films with Square Lattices of Submicron Holes”, V. Metlushko, U. Welp, G. W. Crabtree, Zhao Zhang, S. R. J. Brueck, B. Watkins, L. E. De Long, B. Ilic, K. Chung and P. J. Hesketh, Phys. Rev. B 59, 603 (1999).

120. “Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23nm)/Ni(5nm)]₅ multilayer”, L. E. De Long, S. A. Kryukov, A. G. Joshi, Wentao Xu, A. Bosomtwi, B. J. Kirby and M. R. Fitzsimmons, Physica C 468, 523-530 (2007).

99. “Flux Line Depinning in a Magnet-Superconductor Levitation System”, A. N. Terentiev, J. R. Hull and L. E. De Long, Physica C 341-348, 1289-1290 (2000).

3. "The Re-Entrant Superconducting - Normal Phase Boundary of the Kondo System (LaCe)Al₂", M. B. Maple, W. A. Fertig, A. C. Mota, L. E. DeLong, D. Wohlleben and R. Fitzgerald, Solid State Commun. 11, 829 (1972).

6. "Observation of a Kondo Effect for a Dilute Alloy Containing Sm Impurities", L. E. DeLong, R. W. McCallum, W. A. Fertig, M. B. Maple and J. G. Huber, Solid State Commun. 22, 245 (1977).

7. "Destruction of Superconductivity at the Onset of Long-Range Magnetic Order in the Compound ErRh₄B₄", W. A. Fertig, D. C. Johnston, L. E. DeLong, R. W. McCallum, M. B. Maple, and B. T. Matthias, Phys. Rev. Lett. 38, 987 (1977). See Also: “The case of vanishing superconductivity”, Search and Discovery, in: Physics Today, April, 1977, pp. 17-18.

65. "Effect of Pressure on the Reentrant Superconducting-Normal Phase Boundaries of the (La_1-nCe_n)Al₂ and (La_1-xTh_x)_1-nCe_nKondo Systems", P. H. Ansari, J. B. Bulman, J. G. Huber, L. E. De Long and M. B. Maple, Phys. Rev. B 49, 3894 (1994-II).

2. "Superconductivity of NbSe₂ to 140 kbar", T. F. Smith, L. E. DeLong, A. R. Moodenbaugh, T. H. Geballe and R. E. Schwall, J. Phys. C: Solid State Phys. 5, L230 (1972).

17. "Fermi Surface Measurements in Layer Chalcogenide Crystals", S. J. Hillenius, L. E. De Long and R. V. Coleman, Physica 105B, 123 (1981).

23. "Observation of Anomalies in the Pressure Dependence of the Superconducting Transition Temperature of Potassium-Based Graphite Intercalation Compounds", L. E. De Long, V. Yeh, V. Tondiglia, P. C. Eklund, S. E. Lambert and M. B. Maple, Phys. Rev. B (Rapid Communications) 26, 6315 (1982).

27. "Suppression of the Energy Gap in SmB₆under Pressure", J. Beille, M. B. Maple, J. Wittig, Z. Fisk and L. E. De Long, Phys. Rev. B (Rapid Communications) 28, 7397 (1983).

21. "Observation of High Field Superconductivity and Exchange-Enhanced Paramagnetism in U₆Fe", L. E. De Long, J. G. Huber, K. N. Yang and M. B. Maple in: W. Buckel and W. Weber, eds., "Superconductivity in d- and f-band Metals 1982" (Kernforschungszentrum Karlsruhe GmbH, Karlsruhe, 1982), pp. 467-471.

26. "Observation of High-Field Superconductivity of a Strongly Interacting Fermi Liquid in U₆Fe", L. E. De Long, J. G. Huber, K. N. Yang and M. B. Maple, Phys. Rev. Lett. 51, 312 (1983). See Also: “Second heavy fermion superconductor”, Physics Today, December, 1983, pp. 20-22.

34. "Low Temperature Magnetization Study of U₆X (X = Mn, Fe, Co, Ni) Compounds", L. E. De Long, R. P. Guertin, S. Hasanain and T. Fariss, Phys. Rev. B 31, 7059 (1985).

35. "Normal and Superconducting State Properties of U₆Fe at Low Temperatures and High Magnetic Fields", L. E. De Long, G. W. Crabtree, L. N. Hall, H. Kierstead, H. Aoki, S. K. Dhar, K. A. Gschneider, Jr. and A. Junod, Physica 135B, 81 (1985).

38. "Phenomenological Trends for Heavy Fermi Liquids and Narrow-Band Metals", L. E. De Long, Phys. Rev. B (Rapid Communications) 33, 3556 (1986).

50. "Magnetoresistive Effects in the Upper Critical Fields of Heavy Fermion Superconductors", L. E. De Long, G. W. Crabtree, L. N. Hall, D. G. Hinks, W. K. Kwok and S. K. Malik, Phys. Rev. B 36, 7155 (1987).

56. "Shape of the Upper Critical Field Curves in URu₂Si₂: Evidence for Anisotropic Pairing", W. K. Kwok, L. E. De Long, G. W. Crabtree, D. G. Hinks and R. Joynt, Phys. Rev B (Rapid Commun.) 41, 11649 (1990).

59. "Criteria for the Occurrence of Ferromagnetism and Weak Magnetic Order in Narrow- Band Metals", L. E. De Long, J. G. Huber and K. S. Bedell, J. Magn. Magn. Mat. 99, 171-189 (1991).

79. “Evidence for an Extended Critical Region near the Metamagnetic Transition of UCoAl”, A. V. Kolomiets, L. Havela, V. Sechovsky, L. E. De Long, D. B. Watkins and A. V. Andreev, J. Appl. Phys. 83, 6435 (1998).

89. “Non-Fermi-Liquid Behavior of U_3-xNi₃Sn_4-y Single Crystals”, L. Shlyk, J. C. Waerenborgh, P. Estrela, L. E. De Long, A. de Visser, and M. Almeida, J. Phys.: Condens. Matter 11, 25 (1999).

104. “X-Ray Absorption Fine Structure and Field-Dependent Specific Heat Measurements of Non-Fermi Liquid U₃Ni₃Sn₄”, C. H. Booth, L. Shlyk, K. Nenkov, J. G. Huber and L. E. De Long, Phys. Rev. B 69, 104430 (2004).

57. "Observation of an Extended Region of Magnetic Reversibility in Nb and NbSe₂", H. Drulis, Z. G. Xu, J. W. Brill, L. E. De Long and J.-C. Hou, Phys. Rev. B (Rapid Commun.) 44, 4731 (1991-I).

63. "Evidence for Possible Interaction between CDW and Magnetic Vortices in 2H-NbSe₂: Comparison with 2H-NbS₂", Z. Xu, H. Drulis, L. E. De Long and J. W. Brill, J. de Physique IV, Colloque C2 3, 27 (1993).

77. "Nonlinear Dynamics of Magnetic Vortices in Single-Crystal and Ion-Damaged NbSe₂", Junqing Zhang, L. E. De Long, V. Majidi and R. C. Budhani, Phys. Rev. B (Rapid Commun.) 53, R8851 (1996).

91. “Paramagnetic Relaxation and Wohlleben Effect in Field-Cooled Nb Thin Films”, A. Terentiev, D. B. Watkins, L. E. De Long, D. J. Morgan and J. B. Ketterson, Phys. Rev. B Rapid Commun. 60, R761 (1999).

92. “Observation of Magnetic Flux Pinning in a Thin Nb Film with a Square Lattice of Nickel Dots”, A. Terentiev, D. B. Watkins, L. E. De Long, D. J. Morgan and J. B. Ketterson, Physica C 324, 1 (1999).

93. “New Interstitial Flux Phases in Superconducting Niobium Film with Square Lattices of Artificial Pinning Centers”, V. Metlushko, U. Welp, G. Crabtree, R. Osgood, S. D. Bader, L. E. De Long, Zhao Zhang, S. R. J. Brueck, B. Ilic, K. Chung and P. J. Hesketh, Phys. Rev. B Rapid Commun. 60, R12585 (1999).

96. “Periodic Magnetization Instablilities in a Superconducting Nb Film with a Square Lattice of Ni Dots”, A. Terentiev, L. E. De Long, D. J. Morgan, J. B. Ketterson and L. D. Cooley, Phys. Rev. B Rapid Commun. 61, R9249 (2000).

101. “Ferromagnetic Resonance in Periodic Particle Arrays”, S. Jung, B. Watkins, L. De Long, J. B. Ketterson and V. Chandrasekhar, Phys. Rev. B 66, 132401-132404 (2002).

102. “Proximity Effect in the Superconducting Magnetization of a Pb/Cu Bilayer Film with an Antidot Lattice”, V. V. Metlushko, L. E. De Long, V. V. Moshchalkov and Y. Bruynseraede, Physica C 391, 196-202, (2003).

103. “Magnetic Switching of Nb/Ni Multilayers near the Superconducting Critical Temperature”, S. A. Kryukov, L. E. De Long, E. Navarro, J. E. Villegas, E. M. Gonzalez and J. L. Vicent, IEEE Trans. Magnetics 39, 2693-2695 (2003).

105. “Patterned Bilayer Films as a New Class of Superconducting Wire Networks”, L. E. De Long, S. Kryukov, V. V. Metlushko, V. V. Moshchalkov and Y. Bruynseraede, Physica C 404, 123-127 (2004).

107. “Atomic-Scale Structural Analysis of Epitaxial Co/Re Superlattices”, Wentao Xu, L. E. De Long, T. Charlton, M. Chisholm and D. Lederman, Appl. Phys. Lett. 85, 4082-4084 (2004).

108. “Ferromagnetic Resonance Study of Nanoscale Ferromagnetic Ring Lattices”, Wentao Xu, D. B. Watkins, L. E. De Long, K. Rivkin, J. B. Ketterson and V. V. Metlushko, J. Appl. Phys. 95, 6645-6647 (2004).

112. “Matching Effects in the Field and Temperature Dependences of the Magnetization of Superconducting/Ferromagnetic Nb/Ni Multilayers”, S. A. Kryukov, A. Bosomtwi, L. E. De Long, E. M. Gonzalez, E. Navarro, J. L. Vicent, J. E. Villegas, and Wentao Xu, J. Chem. Phys. Solids 67, 610-612 (2006).

113. “Dynamic Magnetic Response of Infinite Arrays of Ferromagnetic Particles”, K. Rivkin, W. Saslow, L. E. De Long and J. B. Ketterson, Phys. Rev. B 75, 174408 (2007).

115. “Magnetic Instabilities along the Superconducting Phase Boundary of Nb/Ni Multilayers”, A. G. Joshi, S. A. Kryukov, L. E. De Long, E. M. Gonzalez, E. Navarro, J. E. Villegas and J. L. Vicent, J. Appl. Phys. 101, 09G117 (2007).

120. “Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23nm)/Ni(5nm)]5 multilayer”, L. E. De Long, S. A. Kryukov, A. G. Joshi, Wentao Xu, A. Bosomtwi, B. J. Kirby and M. R. Fitzsimmons, Physica C 468, 523-530 (2007).

136. “Staircase magnetization anomalies in superconducting Pb/Au bilayer films patterned with antidot lattices”, L. E. De Long, S. A. Kryukov, V. V. Metlushko, M. J. A. Stoutimore and D. J. Van Harlingen, Physica C 470, 739-743 (2010).

146. "Generating wave vector specific Damon-Eshbach spin waves in Py using a diffraction grating”, J. Sklenar, V. Bhat, L. E. De Long and J. Ketterson, Appl. Phys. Lett. 101, 52404 (2012).

150. “Strongly Localized Magnetization Modes in Permalloy Antidot Lattices”, J. Sklenar, V. S. Bhat, L. E. De Long, O. Heinonen and J. B. Ketterson, Appl. Phys. Lett. 102, 152412 (2013).

155. “Controlled Magnetic Reversal in Permalloy Films Patterned into Artificial Quasicrystals”, V. S. Bhat, J. Sklenar, B. Farmer, J. Woods, J. T. Hastings, S. J. Lee, J. B. Ketterson and L. E. De Long, Phys. Rev. Lett. 111, 077201 (2013). Figure 1 featured on the Cover Page and Index Page of Physical Review Letters 111, August 16, 2013.

123. “High Temperature Ferromagnetism and Tunable Semiconductivity of (Ba,Sr)M_2±xRu_4±xO₁₁ (M = Fe, Co): A New Paradigm for Spintronics”, L. Shlyk, S. Kryukov, B. Schüpp-Niewa, R. Niewa and L. E. De Long, Adv. Mat. 20, 1315-1320 (2008).

131. “Successive magnetic transitions of the kagome plane and field-driven chirality in single-crystal BaMn_2.49Ru_3.5O₁₁”, L. Shlyk, S. Parkin and L. E. De Long, Phys. Rev. B 81, 014413 (2010).

135. “Magnetic Structure, Magnetization and Magnetotransport Properties of (Ba,Sr)M₂_±xT₄_±xO₁₁ (M = Fe, Co; T = Ru, Ti)”, L. Shlyk, B.G. Ueland, J.W. Lynn, Q. Huang, L.E. De Long and S. Parkin, Phys. Rev. B 81, 184415 (2010).

139. “Anomalous Hall Effect in High Temperature Ferrimagnetic Semiconductors BaFe₂_±xRu₄_±xO₁₁”, L. Shlyk, R. Niewa and L. E. De Long, Phys. Rev. B 82, 134432 (2010).

122. “Observation of Strong Spin Valve Effect in Bulk Ca₃(Ru_1-xCr_x)₂O₇”, G. Cao, V. Durairaj, S. Chikara, L. E. De Long and P. Schlottmann, Phys. Rev. Lett. 100, 016604, 159902 (Erratum), (2008). (This paper was selected for January 21, 2008 issue of Virtual Journal of Nanoscale Science & Technology (American Institute of Physics and the American Physical Society))

138. “Electron-Doped Sr₂IrO_4-_d (0 ≤ d ≤ 0.04): Evolution of a Disordered J_eff = ½ Mott Insulator into an Exotic Metallic State”, O. B. Korneta, Tongfei Qi, S. Chikara, S. Parkin, L. E. De Long, P. Schlottmann and G. Cao, Phys. Rev. B 82, 115117 (2010).

140. “Negative Volume Thermal Expansion via Orbital and Magnetic Orders in Ca₂Ru_1-xCr_xO₄ (0 < x < 0.13)”, T. F. Qi, O. B. Korneta, S. Parkin, L. E. De Long and G. Cao, Phys. Rev. Lett. 105, 177203 (2010).

143. “Giant Magnetoelectric Effect in Antiferromagnetic BaMnO_2.99 and Its Derivatives”, O. B. Korneta, T. F. Qi, M. Ge, L. E. De Long, P. Schlottmann and G. Cao, J. Phys. F: Condens. Matter 23, 435901 (2011).

161. “Novel magnetism of Ir⁵⁺ ions in the double perovskite Sr₂YIrO₆”, G. Cao, T. F. Qi, L. Li, J. Terzic, S. J. Yuan, L. E. De Long, G. Murthy and R. K. Kaul, accepted for publication in Physical Review Letters, January, 2014.

Book Chapters

C1 "Kondo Effect: Alloys and Compounds", M. Brian Maple, Lance E. DeLong and Brian C. Sales, in: Karl A. Gschneidner, Jr., and LeRoy Eyring, Editors, Handbook on the Physics and Chemistry of Rare Earths (North Holland, Amsterdam, 1978) Vol. 1, Chapt. 11.

C2. “The Contradictory Physical Properties and Extreme Anisotropy of Ca₃Ru₂O₇”, Gang Cao L. E. De Long and P. Schlottmann, Chapter 6, in: Frontiers of 4d- and 5d-Transition Metal Oxides, Gang Cao and Lance E. De Long, Eds. (Singapore, World Scientific Publishing, 2013).

C3. “Instability of the J_eff = ½ Insulating State in Sr_n+1Ir_nO_3n+1 (n = 1 and 2)”, Gang Cao and L. E. De Long, Chapter 8, in: Frontiers of 4d- and 5d-Transition Metal Oxides, Gang Cao and Lance E. De Long, Eds. (Singapore, World Scientific Publishing, 2013).

Graduate Training

Ph.D. Thesis: "Superconducting and Normal State Physical Properties of Dilute Alloys of LaSn3 Containing Light Rare Earth Impurities", University of California, San Diego, 1977. (Diss. Abstr. Int. XXXVIII, 1978). Committee in Charge: Prof. M. B. Maple (Chairman), Prof. B. T. Matthias, Prof. H. Suhl, Prof. J. E. Mayer, Prof. J.C. Wheeler

Selected Publications

Selected Publications:

Some of my publications are located here.