Superconducting Fluctuations, Pseudogap and Phase Diagram in Cuprates

Details Superconducting Fluctuations, Pseudogap and Phase Diagram in Cuprates Superconducting Fluctuations, Pseudogap and Phase Diagram in Cuprates

2010-06-16

arxiv.org/abs/1006.3165v2

Europhys. Lett. 91 (2010)37005

Physics

Condensed Matter

Superconductivity

New version with minor corrections

Scientific paper

10.1209/0295-5075/91/37005

We report transport measurements using pulsed magnetic fields to suppress the superconducting fluctuations (SCF) conductivity in a series of YBa_2Cu_3O_(6+x) samples. These experiments allow us altogether to measure the temperature T'c at which SCF disappear, and the pseudogap temperature T*. While the latter are consistent with previous determinations of T*, we find that T'c is slightly larger than similar data taken by Nernst measurements. A careful investigation near optimal doping shows that T* becomes smaller than T'c, which is an unambiguous evidence that the pseudogap cannot be assigned to preformed pairs. Studies of the incidence of disorder on both T'c and T* allow us to propose a phase diagram including disorder which explains most observations done in other cuprate families, and to discuss the available knowledge on the pseudogap line in the phase diagram.

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