Superfluid density and superconducting gaps of RbFe_{2}As_{2} as a function of hydrostatic pressure

Abstract

The superfluid density and superconducting gaps of superconducting RbFe_{2}As_{2} have been determined as a function of temperature, magnetic field and hydrostatic pressure by susceptibility and muon-spin spectroscopy measurements. From the data, fundamental microscopic parameters of the superconducting state like the London penetration depth λ, the gap values Δ, the upper critical field B_{c2}, and the Ginzburg-Landau parameter κhave been obtained. In accordance with earlier measurements the ratio of the superfluid density n_{s} \propto λ^{-2} to the superconducting transition temperature T_{c}=2.52(2) K at ambient pressure is found to be much larger in the strongly hole-overdoped RbFe_{2}As_2 than in high-T_{c} Fe-based and other unconventional superconductors. As a function of pressure T_{c} strongly decreases with a rate of dT_{c}/dp = -1.32 K/GPa, i.e. it is reduced by 52 % at p = 1 GPa. The temperature dependence of n_{s} is best described by a two gap s-wave model with both superconducting gaps being decreased by hydrostatic pressure until smaller gap completely disappears at p = 1 GPa.

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Cited by in corpus (12)

• High pressure research using muons at the Paul Scherrer Institute
• Two-gap superconductivity with line nodes in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Universal V-shaped temperature-pressure phase diagram in the iron-based superconductors KFe2As2, RbFe2As2, and CsFe2As2
• Heat transport in RbFe2As2 single crystal: evidence for nodal superconducting gap
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• Nodal gap in iron-based superconductor CsFe${}_2$As${}_2$ probed by quasiparticle heat transport
• Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals
• Superconductivity emerging from an electronic phase separation in the charge ordered phase of RbFe${}_2$As${}_2$
• Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR
• Probing the pairing symmetry in the over-doped Fe-based superconductor Ba_0.35Rb_0.65Fe_2As_2 as a function of hydrostatic pressure
• Superconducting properties of K${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$ under pressure
• Pressure-induced magnetism in iron-based superconductors $A$Fe${}_2$As${}_2$ ($A=$ K, Cs, Rb)