Vortex Lattice in Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} Well Above the First-Order Phase-Transition Boundary

TL;DR

This study reveals that a rigid vortex lattice persists in Bi_{2}Sr_{2}CaCu_{2}O_{8+eta} superconductors well above the first-order phase transition boundary, indicating complex vortex phase behavior in high magnetic fields.

Contribution

It provides experimental evidence of a vortex lattice existing above the first-order transition boundary and identifies vortex melting and decoupling transitions in high-T_c superconductors.

Findings

Vortex lattice exists above the first-order transition boundary.

Evidence of vortex lattice melting above H_{FOT}.

Detection of vortex liquid decoupling phase transitions.

Abstract

Measurements of non-local in-plane resistance originating from transverse vortex-vortex correlations have been performed on a Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} high-T_c superconductor in a magnetic field up to 9 T applied along the crystal c-axis. Our results demonstrate that a rigid vortex lattice does exist over a broad portion of the magnetic field -- temperature (H-T) phase diagram, well above the first-order transition boundary H_{FOT}(T). The results also provide evidence for the vortex lattice melting and vortex liquid decoupling phase transitions, occurring above the H_{FOT}(T).