Field-dependent superfluid density in the optimally doped SmFeAsO&lt;sub&gt;1-x&lt;/sub&gt;F&lt;sub&gt;y&lt;/sub&gt; superconductor

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.

doi:10.1209/0295-5075/91/47005

Field-dependent superfluid density in the optimally doped SmFeAsO_1-xF_y superconductor

Weyeneth S, Bendele M, Puzniak R, Murányi F, Bussmann-Holder A, Zhigadlo ND, Katrych S, Bukowski Z, Karpinski J, Shengelaya A, Khasanov R & Keller H

Citation

Weyeneth, S., Bendele, M., Puzniak, R., Murányi, F., Bussmann-Holder, A., Zhigadlo, N. D., … Keller, H. (2010). Field-dependent superfluid density in the optimally doped SmFeAsO_1-xF_y superconductor. Europhysics Letters, 91(4), 47005 (6 pp.). https://doi.org/10.1209/0295-5075/91/47005

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:15853

The magnetic-field dependence of the in-plane magnetic penetration depth λ_ab for optimally doped SmFeAsO_1-xF_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 ρ_s ∝ λ_ab^-2 as the field is increased to 1.4 T. This behaviour of ρ_s is analysed within a two-band model with self-consistently derived coupled gaps and ρ_s = ρ_s1 +ρ_s2, where ρ_s1 related to the larger gap is field independent, and ρ_s2 related to the smaller gap is strongly suppressed with increasing field.