High magnetic field studies of the Vortex Lattice structure in YBa2Cu3O7

Abstract

We report on small angle neutron scattering measurements of the vortex lattice in twin-free YBa2Cu3O7, extending the previously investigated maximum field of 11~T up to 16.7~T with the field applied parallel to the c axis. This is the first microscopic study of vortex matter in this region of the superconducting phase. We find the high field VL displays a rhombic structure, with a field-dependent coordination that passes through a square configuration, and which does not lock-in to a field-independent structure. The VL pinning reduces with increasing temperature, but is seen to affect the VL correlation length even above the irreversibility temperature of the lattice structure. At high field and temperature we observe a melting transition, which appears to be first order, with no detectable signal from a vortex liquid above the transition.

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• Deviations from the extended London model at high magnetic fields in YBa${}_2$Cu${}_3$O${}_7$
• Rotational transition, domain formation, dislocations and defects in vortex systems with combined six- and 12-fold anisotropic interactions
• Influence of the Fermi Surface Morphology on the Magnetic Field-Driven Vortex Lattice Structure Transitions in YBa${}_2$Cu${}_3$O${}_{7-\delta }:\delta =$0, 0.15
• Adherence of the rotating vortex lattice in the noncentrosymmetric superconductor Ru${}_7$B${}_3$ to the London model