Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-18267
Weyeneth, S; Puzniak, R; Zhigadlo, N D; Katrych, S; Bukowski, Z; Karpinski, J; Keller, H (2009). Evidence for two distinct anisotropies in the oxypnictide superconductors SmFeAsO0.8F0.2 and NdFeAsO0.8F0.2. Journal of Superconductivity and Novel Magnetism, 22(4):347-351.
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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 γ λ differently than the upper critical field anisotropy γ H, provides evidence that in the oxypnictide superconductors two distinct anisotropies are present. As a result γ λ differs significantly in magnitude and in temperature dependence from γ 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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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Physics Institute|
|Deposited On:||17 Apr 2009 07:15|
|Last Modified:||27 Nov 2013 17:36|
|Additional Information:||The original publication is available at www.springerlink.com|
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