Is there a vortex-glass transition in high-temperature superconductors?

Details Is there a vortex-glass transition in high-temperature superconductors? Is there a vortex-glass transition in high-temperature superconductors?

2000-11-01

arxiv.org/abs/cond-mat/0011014v1

Phys. Rev. Lett. 87, 67007 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.067007

We show that DC voltage versus current measurements of a YBCO micro-bridge in a magnetic field can be collapsed onto scaling functions proposed by Fisher, Fisher, and Huse, as is widely reported in the literature. We find, however, that good data collapse is achieved for a wide range of critical exponents and temperatures. These results strongly suggest that agreement with scaling alone does not prove the existence of a phase transition. We propose a criterion to determine if the data collapse is valid, and thus if a phase transition occurs. To our knowledge, none of the data reported in the literature meet our criterion.

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