Electronic instabilities in the quasi two-dimensional monophosphate tungsten bronze (PO₂)₄(WO₃)_2m (m = 13)

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• 作者：Hess ; C. ; Schlenker ; C. ; Marcus ; J. ; Hodeau ; J.L. ; Ottolenghi ; A. ; Pouget ; J.P.
• 关键词：X-ray diffraction and scattering ; Transport measurements ; Conductivity ; Hall effect ; Thermopower ; Other phase transitions ; Charge density waves ; Oxide bronzes
• 刊名：Synthetic Metals
• 出版年：1997
• 期刊代码：77_03796779
• 类别：ph
• 出版时间：February 28, 1997
• 卷：86
• 期：1-3
• 页码：2169-2170
• 文件大小：208 K

摘要

Single crystals of (PO₂)₄(WO₃)_2m (m = 13) have been studied by x-ray diffuse scattering and transport (resistivity, Hall effect and thermopower) measurements. Three instabilities are found at T_c0 = 510 K, T_c1 = 550 K and T_c2 = 160 K with modulations of wavevector q₀ = (0.5,0,0), q1 = (0.053,0.016,?) and q₂ = (0.178,0.145,?). The q₁ an q₂ instabilities are attributed to charge density waves and the go one to an antiferroelectric distortion.