Field Dependent Coherence Length in the Superclean, High-Kappa Superconductor CeCoIn5

Abstract

Using small-angle neutron scattering, we have studied the flux-line lattice (FLL) in superconducting CeCoIn5. The FLL is found to undergo a first-order symmetry and reorientation transition at ~0.55 T at 50 mK. The FLL form factor in this material is found to be independent of the applied magnetic field, in striking contrast to the exponential decrease usually observed in superconductors. This result is consistent with a strongly field-dependent coherence length in CeCoIn5, in agreement with recent theoretical predictions for superclean, high-kappa superconductors.

References in corpus (3)

• Unpaired Electrons in the Heavy-Fermion Superconductor CeCoIn_{5}
• Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn_5
• Hexagonal and Square Flux Line Lattices in CeCoIn5

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• Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy
• Pressure studies of the quantum critical alloy Ce(0.93)Yb(0.07)CoIn5
• Field Dependence of the Superconducting Basal Plane Anisotropy of TmNi2B2C