Composite to tilted vortex lattice transition in $Bi_2 Sr_2 CaCu_2 O_{8+δ}$ in oblique fields

Details Composite to tilted vortex lattice transition in $Bi_2 Sr_2 CaCu_2 O_{8+δ}$ in oblique fields Composite to tilted vortex lattice transition in $Bi_2 Sr_2 CaCu_2 O_{8+δ}$ in oblique fields

2007-03-19

arxiv.org/abs/cond-mat/0703482v1

Physical review letters 97 (07/2006) 237005

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.97.237005

Precision measurements of the vortex phase diagram in single crystals of the layered superconductor Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ in oblique magnetic fields confirm the existence of a second phase transition, in addition to the usual first order vortex lattice melting line $H_{m}(T)$. The transition has a strong first order character, is accompanied by strong hysteresis, and intersects the melting line in a tricritical point ($H_{m}^{\perp}$, $H^{\parallel}_{cr}$). Its field dependence and the changing character of the melting line at the tricritical point strongly suggest that the ground state for magnetic fields closely aligned with the superconducting layers is a lattice of uniformly tilted vortex lines.

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