Specific heat anomalies in the quasi two-dimensional monophosphate tungsten bronzes KxP4W8O32

V. Bondarenko; J. W. Brill; J. Dumas; C. Schlenker

doi:10.1016/j.ssc.2003.10.014

Specific heat anomalies in the quasi two-dimensional monophosphate tungsten bronzes K_xP₄W₈O₃₂

V. Bondarenko, J. W. Brill, J. Dumas, C. Schlenker

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The monophosphate tungsten bronzes K_xP₄W ₈O₃₂ (0.75 < x < 2) are quasi-two-dimensional conductors which show electronic transitions at a critical temperature T _c depending on the concentration of the alkali metal. The phase diagram shows a maximum at T_c = 170 K 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.

Original language	English
Pages (from-to)	211-215
Number of pages	5
Journal	Solid State Communications
Volume	129
Issue number	4
DOIs	https://doi.org/10.1016/j.ssc.2003.10.014
State	Published - Jan 2004

Bibliographical note

Funding Information:
The authors wish to thank D. Groult for the crystal growth, S. Drouard for the characterization and transport studies of the crystals measured in this work, P. Foury and J.P. Pouget for helpful discussions. One of us (J.W.B.) acknowledges the support of the US National Science Foundation (Grant #DMR-0100572).

Keywords

A. Monophosphate tungsten bronzes
D. Charge density waves
D. Specific heat

ASJC Scopus subject areas

Chemistry (all)
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/j.ssc.2003.10.014

Cite this

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abstract = "The monophosphate tungsten bronzes KxP4W 8O32 (0.75 < x < 2) are quasi-two-dimensional conductors which show electronic transitions at a critical temperature T c depending on the concentration of the alkali metal. The phase diagram shows a maximum at Tc = 170 K 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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AU - Bondarenko, V.

AU - Brill, J. W.

AU - Dumas, J.

AU - Schlenker, C.

N1 - Funding Information: The authors wish to thank D. Groult for the crystal growth, S. Drouard for the characterization and transport studies of the crystals measured in this work, P. Foury and J.P. Pouget for helpful discussions. One of us (J.W.B.) acknowledges the support of the US National Science Foundation (Grant #DMR-0100572).

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AB - The monophosphate tungsten bronzes KxP4W 8O32 (0.75 < x < 2) are quasi-two-dimensional conductors which show electronic transitions at a critical temperature T c depending on the concentration of the alkali metal. The phase diagram shows a maximum at Tc = 170 K 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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