Vortex lattice studies in CeCoIn5 with H perpendicular to c

TL;DR

This study uses small angle neutron scattering to investigate vortex lattice structures in CeCoIn5 under different magnetic field orientations, revealing reorientation transitions, anisotropic distortions, and strong Pauli paramagnetic effects.

Contribution

It provides new insights into the vortex lattice behavior and anisotropy in CeCoIn5 with magnetic fields aligned along different crystallographic directions.

Findings

Single vortex lattice orientation for H || [100]

90-degree reorientation transition for H || [110]

Strong Pauli paramagnetic effects observed

Abstract

We present small angle neutron scattering studies of the vortex lattice (VL) in CeCoIn5 with magnetic fields applied parallel (H) to the antinodal [100] and nodal [110] directions. For H || [100], a single VL orientation is observed, while a 90 degree reorientation transition is found for H || [110]. For both field orientations and VL configurations we find a distorted hexagonal VL with an anisotropy, Gamma = 2.0 +/- 0.05. The VL form factor shows strong Pauli paramagnetic effects similar to what have previously been reported for H || [001]. At high fields, above which the upper critical field (Hc2) becomes a first-order transition, an increased disordering of the VL is observed.