Field Dependent Superfluid Density in the Optimally Doped SmFeAsO_(1-x)F_y Superconductor

Abstract

The magnetic field dependence of the in-plane magnetic penetration depth for optimally doped SmFeAsO_(1-x)F_y 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 as the field is increased up to 1.4 T. This behavior is analysed within a two-band model with self-consistently derived coupled gaps, where the superfluid density related to the larger gap is field independent and the superfluid density related to the smaller gap is strongly suppressed with increasing field.

7 pages, 5 figures

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Cited by in corpus (7)

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• SrPt${}_3$P: two-band single-gap superconductor
• AC susceptibility investigation of vortex dynamics in nearly-optimally doped REFeAsO${}_{1-x}$F${}_x$ superconductors (RE = La, Ce, Sm)
• A view from inside iron-based superconductors
• Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdoped SmBa2Cu3Ox