Magnetic-field tuned anisotropy in superconducting Rb(x)Fe(2-y)Se(2)

Details Magnetic-field tuned anisotropy in superconducting Rb(x)Fe(2-y)Se(2) Magnetic-field tuned anisotropy in superconducting Rb(x)Fe(2-y)Se(2)

2011-09-07

arxiv.org/abs/1109.1430v2

Phys. Rev. B 85, 064509 (2012)

Physics

Condensed Matter

Superconductivity

6 pages, accepted in Physical Review B

Scientific paper

10.1103/PhysRevB.85.064509

The anisotropic superconducting properties of a Rb(x)Fe(2-y)Se(2) single crystal with transition temperature 32 K were investigated by means of SQUID and torque magnetometry, probing the effective magnetic penetration depth and the magnetic penetration depth anisotropy. Interestingly, the anisotropy is found to be temperature independent in the superconducting state, but strongly field dependent. This unusual anisotropic behavior, together with a large zero-temperature effective magnetic penetration depth is possibly related to a superconducting state heavily biased by the coexisting antiferromagnetic phase.

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