Reversible magnetization measurement of the anisotropy of the London penetration depth in MgB2 single crystals

Details Reversible magnetization measurement of the anisotropy of the London penetration depth in MgB2 single crystals Reversible magnetization measurement of the anisotropy of the London penetration depth in MgB2 single crystals

2004-03-08

arxiv.org/abs/cond-mat/0403198v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.69.184514

We have studied the anisotropy of the London penetration depth, which was obtained from reversible magnetization measurements with the magnetic field both parallel and perpendicular to the c-axis. The anisotropy of the London penetration depth has a smaller magnitude than the anisotropy of the upper critical field and increases with temperature while that of the upper critical field decreases as reported earlier. This behavior is in sharp contrast with the behaviors of superconductors with one superconducting energy gap. The temperature dependence of the anisotropies of the London penetration depth and of the upper critical field can be well explained within the theory of two-gap superconductivity in MgB2.

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