Physics – Condensed Matter – Superconductivity
Scientific paper
2001-12-10
Phys. Rev. Lett. 88, 167004 (2002)
Physics
Condensed Matter
Superconductivity
RevTex4, 5 pages, 5 figures, some revisions, changed Fig. 5; accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.88.167004
The anisotropy gamma of the superconducting state of high quality single-crystals of MgB2 was determined, using torque magnetometry with two different methods. The anisotropy of the upper critical field was found to be temperature dependent, decreasing from gamma = 6 at 15 K to 2.8 at 35 K. Reversible torque data near Tc reveal a field dependent anisotropy, increasing nearly linearly from gamma = 2 in zero field to 3.7 in 10 kOe. The unusual temperature dependence is a true bulk property and can be explained by non-local effects of anisotropic pairing and/or the wave vector dependence of the effective mass tensor.
Angst Manuel
Jun Jinha
Karpinski Janusz
Kazakov Sergey M.
Keller Hugo
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