Kenneth Gray - Argonne National Laboratories, Materials Sicence Division

Kenneth Gray

Group Leader, Sr. Physicist
Bldg. 223, A-125
Phone: 630-252-9595
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Biography

Kenneth E. Gray is a Senior Scientist in the Materials Science Division. His experimental thesis involved tunneling studies of superconductors and non-equilibrium effects. He joined Argonne's superconductivity group as a post-doc, and in 1972 became a staff member specializing in non-equilibrium effects in superconductors. He is presently the group leader of the Emerging Materials Group. He was the Director for the NATO Advanced Study Institute "Nonequilibrium Superconductivity, Phonons and Kapitza Boundaries" Maratea, Italy, August 25-September 5, 1980 and Chairman of the "1992 Applied Superconductivity Conference" Chicago, Illinois, August 23-28, 1992. He was the Thin Film Research Area Coordinator for the NSF Science and Technology Center for Superconductivity (University of Illinois, Urbana), Feb. 1989-Jan. 1992. He edited Nonequilibrium Superconductivity, Phonons and Kapitza Boundaries, (Plenum Publishing Corporation, 1981). He holds 5 patents, and Research and Development Magazine recognized two of his inventions as among the 100 most significant technical products of their year. These are the Superconducting Tunnel Junction Transistor in 1979 and the 3He/4He Dilution Refrigerator (with P. Roach) in 1988. He received the 1989 Significant Implication for Department of Energy Related Technologies in Solid State Physics - "Thin-Film Superconducting Device Concepts and Development". He has co-authored 250 publications (5300 citations) and is known for research collaborations on flux dynamics and point-contact tunneling in high-temperature superconductors and transport measurements in the highly anisotropic colossal magnetoresistive layered manganites. He is a Senior Scientist and the Group Leader for the Emerging Materials Group at Argonne. His current research interests include tunneling in exotic superconductors, phase diagrams of layered manganites and non-equilibrium effects in complex electronic oxides. He was also an integral part of the recent development of a compact solid-state source for THz radiation.

Selected Publications

Charge and orbital ordered phases of La_1.2Sr_1.8Mn₂O_7-d, Zheng, H; Li, Q; Gray, KE; Mitchell, JF. Phys. Rev. B 78, 155103 (2008) [doi]

Emission of Coherent THz-Radiation from Superconductors, L. Ozyuzer, A.E. Koshelev, C. Kurter, N. Gopalsami, Qing’An Li, M. Tachiki, K. Kadowaki, T. Yamamoto, H. Minami, H. Yamaguchi, T. Tachiki, K.E. Gray, W.K. Kwok and U. Welp, Science 318, 1291 (2007) [doi]

Full Bulk Spin Polarization and Intrinsic Tunnel Barriers at Surfaces of Naturally-Layered Manganites, J. W. Freeland, K. E. Gray, P. Berghuis, L. Ozuyzer, E. Badica, J. Kavich, H. Zheng and J. F. Mitchell, Nature Materials 4, 62-67 (2005) [doi]

Re-Entrant Orbital Order and the True Ground State of LaSr₂Mn₂O₇, Q. Li, K. E. Gray, H. Zheng, H. Claus, S. Rosenkranz, S. N. Ancona, R. Osborn and J. F. Mitchell, Phys. Rev. Lett. 98, 167201 (2007) [doi]

Persistence of Strong Electron Coupling to a Narrow Boson Spectrum in Overdoped Bi₂Sr₂CaCu₂O_8+δ Tunneling Data, J. F. Zasadzinski, L. Ozyuzer, L. Coffey, K. E. Gray, D. G. Hinks and C. Kendziora, Phys. Rev. Lett. 96, 017004 (2006) [doi]

First-Order Metal-Insulator Transitions in Manganites: Are They Universal? Q. Li, K. E. Gray, S. N. Ancona, H. Zheng, S. Rosenkranz, R. Osborn and J. F. Mitchell, Phys. Rev. Lett. 96, 087201 (2006) [doi]