Point-contact spectroscopy of MgB2

Details Point-contact spectroscopy of MgB2 Point-contact spectroscopy of MgB2

2002-11-25

arxiv.org/abs/cond-mat/0211544v1

Physica C 385 (2003), 244

Physics

Condensed Matter

Superconductivity

14 pages incl. 8 eps figures

Scientific paper

10.1016/S0921-4534(02)02344-4

Point-contact spectroscopy measurements on magnesium diboride reveal the existence of two superconducting energy gaps closing at the same transition temperature in line with the multiband model of superconductivity. The sizes of the two gaps ($\Delta_{\pi}$ = 2.8 meV and $\Delta_{\sigma}$ = 6.5-7 meV) are respectively smaller and larger than the expected weak coupling value of the one-gap superconductor. The smaller gap is rapidly filled by a small magnetic field of about 1-2 Tesla much lower than the real upper critical field $H_{c2}$. The larger gap is closed at the anisotropic $H_{c2}$. Above the gap energies reproducible non-linearities are observed at the characteristic phonon energies of MgB$_2$.

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