Probing the electron-phonon coupling in MgB2 through magnetoresistance measurements in neutron irradiated thin films
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.
- Publication:
-
EPL (Europhysics Letters)
- Pub Date:
- March 2008
- DOI:
- 10.1209/0295-5075/81/67006
- arXiv:
- arXiv:0706.3591
- Bibcode:
- 2008EL.....8167006M
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 13 pages, 4 figures, 1 table