Complicated nature of the gap in MgB2: magnetic field-dependent optical studies

Details Complicated nature of the gap in MgB2: magnetic field-dependent optical studies Complicated nature of the gap in MgB2: magnetic field-dependent optical studies

2002-04-09

arxiv.org/abs/cond-mat/0204200v2

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures, submitted to PRB (Corrected typos : changed form)

Scientific paper

10.1103/PhysRevB.65.224519

We investigated the magnetic field (H)-dependent optical conductivity spectra of MgB2 thin film in the far-infrared region. The H-dependences can be explained by the increase of normal metallic regions embedded in the superconducting background. The area fraction of the normal metallic region increases rather quickly at low field, but slowly at high field. It follows neither H- nor H^{1/2}-dependences. The results suggest the complicated nature of the superconducting gap in MgB2.

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