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Superconducting fluctuations, pseudogap and phase diagram in cuprates
We report transport measurements using pulsed magnetic fields to suppress the superconducting fluctuations (SCF) conductivity in a series of YBa2Cu3O6+x samples. These experiments allow us altogether to measure the temperature Tc′ at which SCF disappear, and the pseudogap temperature T*. While the l...
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Published in: | Europhysics letters 2010-08, Vol.91 (3), p.37005 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We report transport measurements using pulsed magnetic fields to suppress the superconducting fluctuations (SCF) conductivity in a series of YBa2Cu3O6+x samples. These experiments allow us altogether to measure the temperature Tc′ at which SCF disappear, and the pseudogap temperature T*. While the latter are consistent with previous determinations of T*, we find that Tc′ is slightly larger than similar data taken by Nernst measurements. A careful investigation near optimal doping shows that T* becomes smaller than Tc′, which is an unambiguous evidence that the pseudogap cannot be assigned to preformed pairs. Studies of the incidence of disorder on both Tc′ 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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ISSN: | 0295-5075 1286-4854 |
DOI: | 10.1209/0295-5075/91/37005 |