Experimental study of electron-phonon properties in ZrB 2

E. Forzani () and K. Winzer

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 51, issue 1, 29-40

Abstract: High quality samples and absence of superconductivity down to 40 mK make of ZrB 2 the best normal state reference system for the superconducting isostructural MgB 2 . Actually, the question of pairing has to be focused on the electron-phonon interaction in the normal state. After presenting the resistivity measurements of ZrB 2 , we explain the details of the Bloch-Grüneisen and Einstein models used to deduce the first results. We then compare experimental de Haas-van Alphen effect data with theoretical Fermi surfaces to present additional results on electron quasi-particle renormalization. The estimations reveal an isotropic and negligible coupling constant of in average $\left\langle \lambda_{tr} \right\rangle=$ 0.145. The contribution of the coupling to the optical phonon modes is 0.082, in contrast to the known larger coupling of 0.283 [3] to the E 2g phonon mode in MgB 2 . Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 71.18.+y Fermi surface: calculations and measurements; effective mass, g factor, 71.38.-k Polarons and electron-phonon interactions, 72.10.-d Theory of electronic transport; scattering mechanisms, 74.25.Fy Transport properties, (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00190-1

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