Specific heat anomalies in the quasi two-dimensional monophosphate tungsten bronzes KxP4W8O32 |
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Authors: | V. Bondarenko J.W. Brill C. Schlenker |
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Affiliation: | a Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA b Laboratoire d'Etudes des Propriétés Electroniques des Solides22Associated to Université Joseph Fourier and Institut National Polytechnique de Grenoble. CNRS-BP 166, F 38042 Grenoble Cedex 9, France |
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Abstract: | The monophosphate tungsten bronzes KxP4W8O32 (0.75<x<2) are quasi-two-dimensional conductors which show electronic transitions at a critical temperature Tc depending on the concentration of the alkali metal. The phase diagram shows a maximum at for x=1.30. We report specific heat measurements in the range 120-190 K. The thermal anomalies found at the transition temperature are larger than in conventional charge density wave materials. This corroborates that the transition is not a ‘pure’ charge density wave transition and that a structural transition dominates the instability. |
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Keywords: | 71.45.Lr 65.40 Lr |
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