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Thermodynamic properties of the spin-Peierls transition in CuGeO3 (1995)

Weiden, M. ; Köhler, J. ; Sparn, G. ; [weitere]

Springer

The European physical journal 98 (1995), S. 167-169

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Details

ISSN: 1434-6036

Schlagwort(e): 65.50 + m ; 75.10.Jm ; 75.50.Ee

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01324522

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