# Point contract spectroscopy and temperature dependence of resistivity of metallic Sodium Tungsten Bronzes - Role of optical phonons

Gayathri, N and Raychaudhuri, AK (2004) Point contract spectroscopy and temperature dependence of resistivity of metallic Sodium Tungsten Bronzes - Role of optical phonons. In: Journal of Low Temperature Physics, 137 (3-4). pp. 471-489.

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## Abstract

In this paper we report the results of electrical resistivity $(1.5\leq T \leq 300K)$ and point contact spectroscopy (PCS) measurements on single crystals of metallic sodium tungsten bronze with varying sodium content. We have shown that the electron-phonon coupling function as measured through PCS can explain quantitatively the large temperature dependence of resistivity p seen in these materials over the entire temperature range. The electron-phonon coupling function shows predominately large peaks for phonon frequency range of 30 meV $\leq\hspace{1mm}ui\hspace{1mm}\leq$ 100 meV which match well with the calculated optical phonons for WOs octahedron. The integrated electron-phonon coupling constant A from this data is fa 0.25-0.45, depending on the Na content.

Item Type: Journal Article Copyright of this article belongs to Springer. Spectroscopy;Metallic Sodium Tungsten Bronzes;Optical Phonons Division of Physical & Mathematical Sciences > Physics 24 Oct 2007 19 Sep 2010 04:40 http://eprints.iisc.ernet.in/id/eprint/12317