Volume 46, Number 5, June I 1999
|Page(s)||685 - 691|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 December 2003|
A heat capacity investigation of the soliton lattice in the high-field incommensurate phase of
Centre de Recherches sur les Très Basses
Températures and Laboratoire des Champs Magnétiques
Intenses, Laboratoires associés à l'Université Joseph
Fourier, CNRS BP 166, F-38042 Grenoble Cedex 9, France
2 Bay Zoltán Foundation for Applied Research, Institute of Logistics and Production Systems Miskolc-Tapolca - Iglói u. 2. H-3519, Hungary
3 Institut für Tieftemperaturphysik - T. U. Dresden, D-01069 Dresden, Germany
4 Laboratoire de Chimie des Solides, URA 446 CNRS, Université Paris-Sud F-91405 Orsay Cedex, France
Accepted: 18 March 1999
We report on a heat capacity investigation of the spin-Peierls compound CuGeO3 by magnetic field sweeps up to 27 T at fixed temperatures. In the dimerized phase the heat capacity exhibits a simple quadratic field dependence. In contrast, non-monotonous variations occur in the incommensurate phase, with characteristic plateaus separated by steps or smoother variations, depending on the quality of the samples. Such a plateau-type structure is attributed to the dynamics of solitons where a pinning mechanism blocks the continuous rearrangement of the soliton lattice driven by the magnetic field.
PACS: 75.10.Jm – Quantized spin models / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 64.70.Rh – Commensurate-incommensurate transitions
© EDP Sciences, 1999
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