期刊
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
卷 22, 期 4, 页码 347-351出版社
SPRINGER
DOI: 10.1007/s10948-009-0445-1
关键词
Oxypnictides; Anisotropy; Multi-band superconductivity; Single crystal; Torque magnetometry; Magnetic penetration depth; Upper critical field
资金
- Swiss National Science Foundation
- NCCR
- Polish Ministry of Science and Higher Education [N202 4132 33]
- EU Project CoMePhS
Single crystals of the oxypnictide superconductors SmFeAsO0.8F0.2 and NdFeAsO0.8F0.2 with T (c) in the range of 44 to 48 K were investigated by torque magnetometry. An analysis of the data in terms of a recently proposed model for the anisotropic magnetization in the superconducting state, treating the magnetic penetration depth anisotropy gamma (lambda) differently than the upper critical field anisotropy gamma (H) , provides evidence that in the oxypnictide superconductors two distinct anisotropies are present. As a result gamma (lambda) differs significantly in magnitude and in temperature dependence from gamma (H) , analogous to MgB2 but with a reversed sign of slope. This scenario strongly suggests a new multi-band mechanism in the novel class of oxypnictide high-temperature superconductors.
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