On the Origin of the Double Superconducting Transition in Overdoped YBa2Cu3Ox

Details On the Origin of the Double Superconducting Transition in Overdoped YBa2Cu3Ox On the Origin of the Double Superconducting Transition in Overdoped YBa2Cu3Ox

2005-12-08

arxiv.org/abs/cond-mat/0512170v1

Physics

Condensed Matter

Superconductivity

9 pages, 3 figures

Scientific paper

10.1016/j.physc.2005.12.066

The superconducting transition in a single overdoped, detwinned YBa2Cu3Ox (YBCO) crystal is studied using four different probes. Whereas the AC and DC magnetic susceptibilities find a dominant transition at 88 K with a smaller effect near 92 K, the specific heat and electrical resistivity reveal only a single transition at 88 K and 92 K, respectively. Under hydrostatic pressures to 0.60 GPa these two transitions shift in opposite directions, their separation increasing. The present experiments clearly show that the bulk transition lies at 88 K and originates from fully oxygenated YBCO; the 92 K transition likely arises from filamentary superconductivity in a minority optimally doped phase (< 1 %) of YBCO located at or near the crystal surface.

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