Mutual independence of critical temperature and superfluid density under pressure in optimally electron-doped superconducting LaFeAsO${}_{1-x}$F${}_x$

Abstract

The superconducting properties of LaFeAsO${}_{1-x}$F${}_x$ in conditions of optimal electron-doping are investigated upon the application of external pressure up to $\sim 23$ kbar. Measurements of muon-spin spectroscopy and dc magnetometry evidence a clear mutual independence between the critical temperature $T_c$ and the low-temperature saturation value for the ratio $n_s/m^{\ast }$ (superfluid density over effective band mass of Cooper pairs). Remarkably, a dramatic increase of $\sim 30$ % is reported for $n_s/m^{\ast }$ at the maximum pressure value while $T_c$ is substantially unaffected in the whole accessed experimental window. We argue and demonstrate that the explanation for the observed results must take the effect of non-magnetic impurities on multi-band superconductivity into account. In particular, the unique possibility to modify the ratio between intra-band and inter-bands scattering rates by acting on structural parameters while keeping the amount of chemical disorder constant is a striking result of our proposed model.

8 pages (Main text: 5 pages. Paper merged with supplemental information), 5 figures

References in corpus (13)

• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Orbital-driven nematicity in FeSe
• Field and Temperature Dependence of the Superfluid Density in LaO_{1-x}F_xFeAs Superconductors: A Muon Spin Relaxation Study
• Superfluid density of the $\pm$s-wave state for the iron-based superconductors
• Superfluid density and penetration depth in Fe-pnictides
• Condensation, excitation, pairing, and superfluid density in high-$T_c$ superconductors: magnetic resonance mode as a roton analogue and a possible spin-mediated pairing
• Enhancement of $T_c$ by disorder in underdoped iron pnictides
• MuSR studies of RE(O,F)FeAs (RE = La, Nd, Ce) and LaOFeP systems: possible incommensurate/stripe magnetism and superfluid density
• Correlated pressure effects on structure and superconductivity in LaFeAsO0.9F0.1
• Common effect of chemical and external pressures on the magnetic properties of RECoPO (RE = La, Pr)
• Manipulation of gap nodes by uniaxial strain in iron-based superconductors
• Superconductivity at 52 K in hydrogen-substituted LaFeAsO1-xHx under high pressure

Cited by in corpus (15)

• High pressure research using muons at the Paul Scherrer Institute
• Direct evidence for the emergence of a pressure induced nodal superconducting gap in the iron-based superconductor Ba_0.65Rb_0.35Fe_2As_2
• Iron-based superconductors: tales from the nuclei
• Superconducting gap structure in ambient-pressure-grown $\mathrm{La}{\mathrm{O}}_{0.5}{\mathrm{F}}_{0.5}\mathrm{Bi}{\mathrm{S}}_2$
• Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors
• Probing the pairing symmetry in the over-doped Fe-based superconductor Ba_0.35Rb_0.65Fe_2As_2 as a function of hydrostatic pressure
• Electronic structure, lattice dynamics and magnetism of new ThXAsN (X=Fe,Co,Ni) superconductors: A First Principles Study
• Unconventional pressure dependence of the superfluid density in the nodeless topological superconductor $\alpha$-PdBi${}_2$
• Monopole-limited nucleation of magnetism in Eu${}_2$Ir${}_2$O${}_7$
• A unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters
• Pressure effects on the electronic properties of the undoped superconductor ThFeAsN
• Common effect of chemical and external pressures on the magnetic properties of $R$CoPO ($R$ = La, Pr, Nd, Sm). II
• Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO${}_{0.89}$F${}_{0.11}$ by Mn/Fe substitution
• Time reversal invariant single gap superconductivity with upper critical field larger than Pauli limit in NbIr${}_2$B${}_2$
• Tuning the magnetocrystalline anisotropy in $R$CoPO by means of $R$ substitution: a ferromagnetic resonance study