https://doi.org/10.1140/epjb/e2006-00190-1
Experimental study of electron-phonon properties in ZrB 2
Erstes Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany
Corresponding author: a eforzan@gwdg.de
Received:
20
September
2005
Revised:
8
March
2006
Published online:
31
May
2006
High quality samples and absence of superconductivity down to 40 mK
make of ZrB2 the best normal state reference system for the superconducting
isostructural MgB2. Actually, the question of pairing has to be focused on
the electron-phonon interaction in the normal state. After presenting the
resistivity measurements of ZrB2, 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 
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 E2g phonon mode
in MgB2.
PACS: 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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
