Mean-field specific heat of CuGeO3

Y. K. Kuo; E. Figueroa; J. W. Brill

doi:10.1016/0038-1098(95)00090-9

Mean-field specific heat of CuGeO₃

Y. K. Kuo, E. Figueroa, J. W. Brill

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

We have measured the specific heat of CuGeO₃ using ac calorimetry. There is a sharp discontinuity at its spin-Peierls phase transition (T_c = 14 K); the magnitude of the jump is consistent with mean-field theory, and implies a nearest neighbor exchange interaction of 75 K. The ratio of the specific heat peak and temperature derivative of the magnetic susceptibility at T_c is consistent with the observed value of d²T_c dH², but this ratio and the activated behavior of c_P below the transition deviate from mean-field behavior.

Original language	English
Pages (from-to)	385-389
Number of pages	5
Journal	Solid State Communications
Volume	94
Issue number	5
DOIs	https://doi.org/10.1016/0038-1098(95)00090-9
State	Published - May 1995

Bibliographical note

Funding Information:
AcknowledgmentW-e appreciateth e assistanceo f M.A. Lloyd and helpful commentso f J.M. Honig, J.C. Lasjauniasa, nd P. Monceau. This work wass ponsoredin part by the U.S. National Science Foundation, grants #EHR-910876a4n d DMR-9300507.

Keywords

A. magnetically ordered materials
D. heat capacity D. phase transitions

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/0038-1098(95)00090-9

Cite this

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title = "Mean-field specific heat of CuGeO3",

abstract = "We have measured the specific heat of CuGeO3 using ac calorimetry. There is a sharp discontinuity at its spin-Peierls phase transition (Tc = 14 K); the magnitude of the jump is consistent with mean-field theory, and implies a nearest neighbor exchange interaction of 75 K. The ratio of the specific heat peak and temperature derivative of the magnetic susceptibility at Tc is consistent with the observed value of d2Tc dH2, but this ratio and the activated behavior of cP below the transition deviate from mean-field behavior.",

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AU - Kuo, Y. K.

AU - Figueroa, E.

AU - Brill, J. W.

N1 - Funding Information: AcknowledgmentW-e appreciateth e assistanceo f M.A. Lloyd and helpful commentso f J.M. Honig, J.C. Lasjauniasa, nd P. Monceau. This work wass ponsoredin part by the U.S. National Science Foundation, grants #EHR-910876a4n d DMR-9300507.

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N2 - We have measured the specific heat of CuGeO3 using ac calorimetry. There is a sharp discontinuity at its spin-Peierls phase transition (Tc = 14 K); the magnitude of the jump is consistent with mean-field theory, and implies a nearest neighbor exchange interaction of 75 K. The ratio of the specific heat peak and temperature derivative of the magnetic susceptibility at Tc is consistent with the observed value of d2Tc dH2, but this ratio and the activated behavior of cP below the transition deviate from mean-field behavior.

AB - We have measured the specific heat of CuGeO3 using ac calorimetry. There is a sharp discontinuity at its spin-Peierls phase transition (Tc = 14 K); the magnitude of the jump is consistent with mean-field theory, and implies a nearest neighbor exchange interaction of 75 K. The ratio of the specific heat peak and temperature derivative of the magnetic susceptibility at Tc is consistent with the observed value of d2Tc dH2, but this ratio and the activated behavior of cP below the transition deviate from mean-field behavior.

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KW - D. heat capacity D. phase transitions

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