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Anisotropy of the Superconducting State in Sr2RuO4

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arxiv 1302.4810 v3 pith:2YVR33FM submitted 2013-02-20 cond-mat.supr-con

Anisotropy of the Superconducting State in Sr2RuO4

C. Rastovski , C. D. Dewhurst , W. J. Gannon , D. C. Peets , H. Takatsu , Y. Maeno , M. Ichioka , K. Machida
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M. R. Eskildsen
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classification cond-mat.supr-con
keywords sr2ruo4anisotropysuperconductingaxisbasalfieldplaneadvantage
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Despite intense studies the exact nature of the order parameter in superconducting Sr2RuO4 remains unresolved. We have used small-angle neutron scattering to study the vortex lattice in Sr2RuO4 with the field applied close to the basal plane, taking advantage of the transverse magnetization. We measured the intrinsic superconducting anisotropy between the c axis and the Ru-O basal plane (~60), which greatly exceeds the upper critical field anisotropy (~20). Our result imposes significant constraints on possible models of triplet pairing in Sr2RuO4 and raises questions concerning the direction of the zero spin projection axis.

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