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

Physics – Condensed Matter – Superconductivity

Scientific paper

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13 pages, 4 figures, 1 table

Scientific paper

10.1209/0295-5075/81/67006

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 s-carriers.

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