Probing the electron-phonon coupling in MgB2 through magnetoresistance measurements in neutron irradiated thin films

Monni, M. and Pallecchi, I. and Ferdeghini, C. and Ferrando, V. and Floris, A. and Galleani d'Agliano, E. and Lehmann, E. and Sheikin, I. and Tarantini, C. and Xi, X. X. and Massidda, S. and Putti, M. (2008) Probing the electron-phonon coupling in MgB2 through magnetoresistance measurements in neutron irradiated thin films. EPL (Europhysics Letters), 81 (6). p. 67006. ISSN 0295-5075

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Item Type:Article
Item Status:Live Archive

Abstract

We report magnetoresistance (MR) measurements on MgB2 and the corresponding full account from ab initio calculations; we suggest that this combination can be a useful tool to probe electron-phonon coupling. We obtain good quantitative agreement between high-field measurements on neutron-irradiated epitaxial thin films and calculations within Bloch-Boltzmann transport theory over a wide range of magnetic fields (0–28 T) and temperatures (40–300 K), and as a function of the field orientation. The crossovers between in-plane and out-of-plane MR, experimentally observed as a function of either disorder or temperature are well reproduced indicating that disorder and interaction with phonons strongly affect the scattering rate of σ-carriers.

Keywords:Superconductivity
Subjects:F Physical Sciences > F321 Solid state Physics
Divisions:College of Science > School of Mathematics and Physics
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ID Code:22803
Deposited On:07 Jun 2016 15:43

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