Observations of Pauli Paramagnetic Effects on the Flux Line Lattice in CeCoIn5

Abstract

From small-angle neutron scattering studies of the flux line lattice (FLL) in CeCoIn5, with magnetic field applied parallel to the crystal c-axis, we obtain the field- and temperature-dependence of the FLL form factor, which is a measure of the spatial variation of the field in the mixed state. We extend our earlier work [A.D. Bianchi et al. 2008 Science 319, 177] to temperatures up to 1250 mK. Over the entire temperature range, paramagnetism in the flux line cores results in an increase of the form factor with field. Near H_c2 the form factor decreases again, and our results indicate that this fall-off extends outside the proposed FFLO region. Instead, we attribute the decrease to a paramagnetic suppression of Cooper pairing. At higher temperatures, a gradual crossover towards more conventional mixed state behavior is observed.

Submitted to New Journal of Physics, 13 pages, 4 figures

References in corpus (11)

• Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
• Microscopic evidence for field-induced magnetism in CeCoIn${}_5$
• Fulde-Ferrell-Larkin-Ovchinnikov state in a perpendicular field of quasi two-dimensional CeCoIn5
• Nodal structure of quasi-2D superconductors probed by magnetic field
• Vortex states in superconductors with strong Pauli-paramagnetic effect
• Hexagonal and Square Flux Line Lattices in CeCoIn5
• Field Dependent Coherence Length in the Superclean, High-Kappa Superconductor CeCoIn5
• Pauli Paramagnetic Effects on Vortices in Superconducting TmNi2B2C
• Instability of square vortex lattice in d-wave superconductors is due to paramagnetic depairing
• Small-angle neutron scattering study of the vortex lattice in superconducting LuNi2B2C
• Comment on ``Texture in the Superconducting Order Parameter of CeCoIn${}_5$ Revealed by Nuclear Magnetic Resonance''

Cited by in corpus (17)

• Evolution of Paramagnetic Quasiparticle Excitations Emerged in the High-Field Superconducting Phase of CeCoIn5
• Pauli-paramagnetic effects on mixed state properties in a strongly anisotropic superconductor ---Application to Sr_2_RuO_4_---
• Magnetic-field-induced nonlocal effects on the vortex interactions in twin-free YBa2Cu3O7
• Strain-induced inter-vortex interaction and vortex lattices in tetragonal superconductors
• Vortex lattice studies in CeCoIn5 with H perpendicular to c
• Anisotropy and multiband superconductivity in Sr2RuO4
• Field Evolution of the Fulde-Ferrell-Larkin-Ovchinnikov State in a Superconductor with Strong Pauli Effects
• Simultaneous Evidence for Pauli Paramagnetic Effects and Multiband Superconductivity in KFe${}_2$As${}_2$ by Small-Angle Neutron Scattering Studies of the Vortex Lattice
• Paramagnetic Effects in the Vortex Lattice Field Distribution of Strongly Type-II Superconductors
• Structural Transitions in Vortex Systems with Anisotropic Interactions
• Eilenberger theory and London theory for transverse components of flux line lattice form factors in uniaxial superconductors
• Conventional Superconductivity in the Doped Kagome Superconductor Cs(V0.86Ta0.14)3Sb5 from Vortex Lattice Studies
• Microscopic Eilenberger theory of Fulde-Ferrell-Larkin-Ovchinnikov states in the presence of vortices
• Fluctuation and Order of Antiferromagnetism induced by Paramagnetic Pair-Breaking in Superconducting Vortex Lattice
• Rotational transition, domain formation, dislocations and defects in vortex systems with combined six- and 12-fold anisotropic interactions
• Deviations from the extended London model at high magnetic fields in YBa${}_2$Cu${}_3$O${}_7$
• Field Dependence of the Superconducting Basal Plane Anisotropy of TmNi2B2C