Abstract
We present an investigation of the spin-Peierls transition atT SP=14.5 K in polycrystalline CuGeO3 through specific-heat and thermal-expansion measurements. Clear second-order phase-transition anomalies are found in both properties atT SP, although only a small entropy of S≈0.1 Rℓn2 is released at the transition. Most of the entropy is released atT SP<T<150 K, where the temperature dependence of the magnetic contribution to the specific heat as well as the thermal expansion exhibit extrema atT *≈40 K. These are caused by one-dimensional antiferromagnetic fluctuations along the Cu chains, possibly accompanied by structural fluctuations. Using Ehrenfest's relation, a hydrostatic pressure coefficient (∂T SP/∂p)p→0 ≈ (0.45±0.06) K/kbar is derived.
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Weiden, M., Köhler, J., Sparn, G. et al. Thermodynamic properties of the spin-Peierls transition in CuGeO3 . Z. Physik B - Condensed Matter 98, 167–169 (1995). https://doi.org/10.1007/BF01324522
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DOI: https://doi.org/10.1007/BF01324522