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Author Martin, M. C. ♦ Shirane, G. ♦ Fujii, Y. ♦ Nishi, M. ♦ Fujita, O. ♦ Akimitsu, J. ♦ Hase, M. ♦ Uchinokura, K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ GERMANIUM OXIDES ♦ ENERGY GAP ♦ COPPER OXIDES ♦ SUPERLATTICES ♦ TEMPERATURE DEPENDENCE ♦ NEUTRON DIFFRACTION ♦ MONOCRYSTALS ♦ SCALING ♦ CRITICAL EXPONENTS ♦ PEIERLS INSTABILITY
Abstract Neutron-scattering measurements on a large single crystal of CuGeO{sub 3} have been used to determine the temperature dependence of the spin-Peierls energy gap. While the power-law behavior of the intensity of structural superlattice peaks is well fit by {ital I}({ital T}){proportional_to}({ital T}{sub {ital c}}{minus}{ital T}){sup 2{beta}} with an exponent of {beta}=0.33, the exponent for the temperature dependence of the energy gap is significantly smaller than expected for conventional spin-Peierls materials. Usual scaling relations relate the energy gap to the superlattice reflection intensity as {Delta}({ital T}){proportional_to}{ital I}{sup {ital a}} with {ital a}=1/3; the present results suggest an exponent of {ital a}{approx_equal}1/6 for CuGeO{sub 3}. An additional scattering cross section is observed in constant-{ital q} and constant-{ital E} scans creating a long tail extending to higher energies relating to a proposed scattering continuum. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Department Brookhaven National Lab. (BNL), Upton, NY (United States)
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 22
Organization Brookhaven National Lab. (BNL), Upton, NY (United States)


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