Field-dependent superfluid density in the optimally doped SmFeAsO1-xFysuperconductor

Weyeneth, S; Bendele, M; Puzniak, R; Murányi, F; Bussmann-Holder, A; Zhigadlo, N D; Katrych, S; Bukowski, Z; Karpinski, J; Shengelaya, A; Khasanov, R; Keller, H (2010). Field-dependent superfluid density in the optimally doped SmFeAsO1-xFysuperconductor. EPL (Europhysics Letters), 91(4):47005.

Abstract

The magnetic-field dependence of the in-plane magnetic penetration depth λab for optimally doped SmFeAsO1−xFy was investigated by combining torque magnetometry, SQUID magnetometry, and muon-spin rotation. The results obtained from these techniques show all a pronounced decrease of the superfluid density ρs∝λab− 2 as the field is increased to 1.4 T. This behaviour of ρs is analysed within a two-band model with self-consistently derived coupled gaps and ρs=ρs1+ρs2, where ρs1 related to the larger gap is field independent, and ρs2 related to the smaller gap is strongly suppressed with increasing field.

Abstract

The magnetic-field dependence of the in-plane magnetic penetration depth λab for optimally doped SmFeAsO1−xFy was investigated by combining torque magnetometry, SQUID magnetometry, and muon-spin rotation. The results obtained from these techniques show all a pronounced decrease of the superfluid density ρs∝λab− 2 as the field is increased to 1.4 T. This behaviour of ρs is analysed within a two-band model with self-consistently derived coupled gaps and ρs=ρs1+ρs2, where ρs1 related to the larger gap is field independent, and ρs2 related to the smaller gap is strongly suppressed with increasing field.

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Citations

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