Thermodynamic properties of the spin-Peierls transition in CuGeO3 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1995-06

AUTHORS

M. Weiden, J. Köhler, G. Sparn, M. Köppen, M. Lang, C. Geibel, F. Steglich

ABSTRACT

We present an investigation of the spin-Peierls transition atTSP=14.5 K in polycrystalline CuGeO3 through specific-heat and thermal-expansion measurements. Clear second-order phase-transition anomalies are found in both properties atTSP, although only a small entropy of S≈0.1 Rℓn2 is released at the transition. Most of the entropy is released atTSPthe 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 (∂TSP/∂p)p→0 ≈ (0.45±0.06) K/kbar is derived. More... »

PAGES

167-169

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01324522

DOI

http://dx.doi.org/10.1007/bf01324522

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1026212083


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