S-wave pairing in the optimally doped LaO0.5F 0.5BiS2 superconductor

G. Lamura, T. Shiroka, P. Bonfà, S. Sanna, R. De Renzi, C. Baines, H. Luetkens, J. Kajitani, Y. Mizuguchi, O. Miura, K. Deguchi, S. Demura, Y. Takano, M. Putti

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53 Citations (Scopus)

Abstract

We report on the magnetic and superconducting properties of LaO 0.5F0.5BiS2 by means of zero- and transverse-field (ZF/TF) muon-spin spectroscopy measurements (μSR). Contrary to previous results on iron-based superconductors, measurements in zero field demonstrate the absence of magnetically ordered phases. TF-μSR data give access to the superfluid density, which shows a marked two-dimensional character with a dominant s-wave temperature behavior. The field dependence of the magnetic penetration depth confirms this finding and further suggests the presence of an anisotropic superconducting gap.

Original languageEnglish
Article number180509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number18
DOIs
Publication statusPublished - 20 Nov 2013
Externally publishedYes

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