Lower Critical Fields of Superconducting PrFeAsO Single Crystals
arXiv:0811.3669 · doi:10.1103/PhysRevB.79.064520
Abstract
We have studied the lower critical fields H_{c1} of superconducting iron oxipnictide PrFeAsO_{1-y} single crystals for H parallel and perpendicular to the ab-planes. Measurements of the local magnetic induction at positions straddling the sample edge by using a miniature Hall-sensor array clearly resolve the first flux penetration from the Meissner state. The temperature dependence of H_{c1} for H || c is well scaled by the in-plane penetration depth without showing any unusual behavior, in contrast to previous reports. The anisotropy of penetration lengths at low temperatures is estimated to be ~ 2.5, which is much smaller than the anisotropy of the coherence lengths. This is indicative of multiband superconductivity in this system, in which the active band for superconductivity is more anisotropic. We also point out that the local induction measured at a position near the center of the crystal, which has been used in a number of reports for the determination of H_{c1}, might seriously overestimate the obtained H_{c1}-value.
7 pages, 7 figures, accepted for publication in Phys. Rev. B
References in corpus (26)
- Superconductivity at 43 K in Samarium-arsenide Oxides
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- LaFeAsOF: A low carrier density superconductor near itinerant magnetism
- Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeOFFeAs
- Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
- Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
- Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
- Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
- Thorium-doping induced superconductivity up to 56 K in Gd1-xThxFeAsO
- Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
- Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
- Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
- Multiband magnetism and superconductivity in Fe-based compounds
- Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
- Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAs
- Bandwidth and Fermi surface of Iron-Oxypnictides: covalency and sensitivity to structural changes
- Field and Temperature Dependence of the Superfluid Density in LaO_{1-x}F_xFeAs Superconductors: A Muon Spin Relaxation Study
- Superconductivity at 53.5 K in GdFeAsO1-delta
- Pseudogap and Superconductivity in Iron-Based Layered Superconductor studied by Fluctuation-Exchange Approximation
- Evidence for Two Gaps and Breakdown of the Uemura Plot in BaKFeAs Single Crystals
- Evidence for two-gap superconductivity in (Ba,K)Fe_2As_2 by directional point contact Andreev reflection spectroscopy
- Specific heat evidence for two-gap superconductivity in ternary-iron silicide LuFeSi
- Upper and lower critical fields in NdFeAs(O,F) single crystals : a study by Hall probe magnetization and specific heat
- Angular dependence of resistivity in the superconducting state of NdFeAsOF single crystals
- Flux Line Lattice Melting and the Formation of a Coherent Quasiparticle Bloch State in the Ultraclean URuSi Superconductor
- Vortex Redistribution below the First-Order Transition Temperature in the β-Pyrochlore Superconductor KOs_2O_6