Yasutomo Uemura
Professor
PHYSICS
Columbia University
United States of America
Biography
Yasutomo Uemura had completed her D.Sc., from University of Tokyo,in 1982
Research Interest
experimental studies of superconductivity and magnetism, using the muon spin relaxation (MuSR) technique. At the TRIUMF meson facility in Vancouver, our team from Columbia has performed extensive MuSR measurements of the magnetic field penetration depth and magnetic ordering in high-Tc cuprate (HTSC), organic, heavy-fermions, and other superconductors and their family materials. These studies have revealed remarkable correlations between Tc and the superconducting carrier density n_{s} in these exotic superconductors. We established a nearly linear relationship between T_{c} and n_{s}/m^{*} in various HTSC systems. Combined with subsequent findings of the “pseudo-gap†behavior, our results suggest that the condensation mechanism in HTSC systems is fundamentally different from that described in the BCS theory, while being rather similar to that in systems which undergo Bose Einstein condensation, such as superfluid ^{4}He.
Publications
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Magnons and Fractons in the Diluted Antiferromagnet MnxZn1-x F2", Phys. Rev. Lett. 57, 1947 (1986); Phys. Rev. B36, 7026 (1987).
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"Muon Spin Relaxation in AuFe and CuMn Spin Glasses", Phys. Rev. Lett. 45, 583 (1980); Phys. Rev. B31, 546 (1985) [234 citations].
