Physics – Condensed Matter – Superconductivity
Scientific paper
2008-06-15
Phys. Rev. Lett. 101, 027003 (2008).
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.101.027003
We present evidence for entangled solid vortex matter in a glassy state in a layered superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+y}$ containing randomly splayed linear defects. The interlayer phase coherence--probed by the Josephson plasma resonance--is enhanced at high temperatures, reflecting the recoupling of vortex liquid by the defects. At low temperatures in the vortex solid state, the interlayer coherence follows a boomerang-shaped reentrant temperature path with an unusual low field decrease in coherence, indicative of meandering vortices. We uncover a distinct temperature scaling between in-plane and out-of-plane critical currents with opposing dependencies on field and time, consistent with the theoretically proposed "splayed-glass" state.
Kato Taichi
Krusin-Elbaum L.
Matsuda Yuichi
Shibauchi Takasada
Thompson Richard Jule Jr.
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