Volume 91, Number 4, August 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||02 September 2010|
Field-dependent superfluid density in the optimally doped SmFeAsO1-xFy superconductor
Physik-Institut der Universität Zürich - Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
2 Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute - CH-5232 Villigen PSI, Switzerland
3 Institute of Physics, Polish Academy of Sciences - Aleja Lotników 32/46, PL-02-668 Warsaw, Poland
4 Max-Planck-Institut für Festkörperforschung - Heisenbergstrasse 1, D-70569 Stuttgart, Germany
5 Laboratory for Solid State Physics, ETH Zurich - Schafmattstrasse 16, CH-8093 Zurich, Switzerland
6 Department of Physics, Tbilisi State University - Chavchavadze 3, GE-0128 Tbilisi, Georgia
Accepted: 5 August 2010
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.
PACS: 74.70.Xa – Pnictides and chalcogenides / 74.25.Ha – Magnetic properties including vortex structures and related phenomena / 76.75.+i – Muon spin rotation and relaxation
© EPLA, 2010
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