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Anisotropy of superconducting single crystal SmFeAsO0.8F0.2 studied by torque magnetometry


Weyeneth, S; Puzniak, R; Mosele, U; Zhigadlo, N D; Katrych, S; Bukowski, Z; Karpinski, J; Kohout, S; Roos, J; Keller, H (2009). Anisotropy of superconducting single crystal SmFeAsO0.8F0.2 studied by torque magnetometry. Journal of Superconductivity and Novel Magnetism, 22(4):325-329.

Abstract

Single crystals of the oxypnictide superconductor SmFeAsO0.8F0.2 with T c≃45(1) K were investigated by torque magnetometry. The crystals of mass ≤0.1 μg were grown by a high-pressure cubic anvil technique. The use of a high-sensitive piezoresistive torque sensor made it possible to study the anisotropic magnetic properties of these tiny crystals. The anisotropy parameter γ was found to be field independent, but varies strongly with temperature ranging from γ≃8 at T≲T c to γ≃23 at T≃0.4T c. This unusual behavior of γ signals unconventional superconductivity.

Abstract

Single crystals of the oxypnictide superconductor SmFeAsO0.8F0.2 with T c≃45(1) K were investigated by torque magnetometry. The crystals of mass ≤0.1 μg were grown by a high-pressure cubic anvil technique. The use of a high-sensitive piezoresistive torque sensor made it possible to study the anisotropic magnetic properties of these tiny crystals. The anisotropy parameter γ was found to be field independent, but varies strongly with temperature ranging from γ≃8 at T≲T c to γ≃23 at T≃0.4T c. This unusual behavior of γ signals unconventional superconductivity.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:May 2009
Deposited On:17 Apr 2009 07:05
Last Modified:05 Apr 2016 12:50
Publisher:Springer
ISSN:1557-1939
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:https://doi.org/10.1007/s10948-008-0413-1

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