Physics – Condensed Matter – Superconductivity
Scientific paper
2002-06-21
Phys. Rev. B 70, 226501 (2004)
Physics
Condensed Matter
Superconductivity
3 pages, 2 figures, submitted to Phys. Rev. B Comment on PRB 66, 012501 (2002) (cond-mat/0205010)
Scientific paper
10.1103/PhysRevB.70.226501
In a recent paper [Phys. Rev. B 66, 012501 (2002)], torque data measured on a MgB2 single crystal in fields from 10 to 60 kOe at 10 K were presented. The authors obtained the anisotropy gamma by fitting a theoretical expression to the data and concluded that the anisotropy is field independent gamma \approx 4.3. They also reported the observation of "intrinsic pinning", which they take as experimental evidence for the occurence of superconductivity in the boron layers. In this comment, we discuss the range of validity of the theoretical expression used by the authors and show that the conclusion of a field independent anisotropy does not hold. Furthermore, we present torque data measured on two crystals of MgB2, establishing the extrinsic nature of the peak in the irreversible torque observed in some crystals.
Angst Manuel
Karpinski Janusz
Keller Hugo
Puzniak Roman
Roos Johanna
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