Magnetotransport and specific heat properties in the charge density wave state of the quasi two-dimensional bronzes (P02)4(W03)2m(m = 4,6,7)

J. LEHMANN; C. SCHLENKER; C. LE TOUZE; A. ROTGER; J. DUMAS; J. MARCUS; Z. TEWELDEMEDHIN; M. GREENBLATT

doi:doi:10.1051/jp4:1993248

Numéro		J. Phys. IV France Volume 03, Numéro C2, Juillet 1993 International Workshop on Electronic Crystals ECRYS - 93


Page(s)		C2-243 - C2-246
DOI		https://doi.org/10.1051/jp4:1993248

International Workshop on Electronic Crystals
ECRYS - 93

J. Phys. IV France 03 (1993) C2-243-C2-246
DOI: 10.1051/jp4:1993248

Magnetotransport and specific heat properties in the charge density wave state of the quasi two-dimensional bronzes (P0₂)₄(W0₃)_2m(m = 4,6,7)

J. LEHMANN¹, C. SCHLENKER¹, C. LE TOUZE¹, A. ROTGER¹, J. DUMAS¹, J. MARCUS¹, Z. TEWELDEMEDHIN² and M. GREENBLATT²

¹ Laboratoire d'Etudes des Propriétés Electroniques des Solides, Associé à l'Université Joseph Fourier, CNRS, BP. 166, 38042 Grenoble cedex 9, France
² Department of Chemistry, Rutgers, The State University of New Jersey, Piscataway, NJ 08855-0939, U.S.A.

Abstract
Hall effect and specific heat have been measured on single crystals of P₄W₈O₃₂, P₄W₁₂O₄₄ and P₄W₁₄O₅₀. The Hall constant is small in the high temperature normal state and IR_HI increases at the Peierls transitions, corroborating the existence of charge density wave gap openings. Specific heat data show that the Debye temperature is in the range 240 K-280 K. Anomalously large γ coefficients of the linear contribution to the specific heat are found. In the case of P₄W₁₄O₅₀, an anomaly found around 45 K provides values of the enthalpy and entropy changes at the low temperature transition.