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...

Full description

Saved in:
Bibliographic Details
Published in:Europhysics letters 2010-08, Vol.91 (3), p.37005
Main Authors: Alloul, H, Rullier-Albenque, F, Vignolle, B, Colson, D, Forget, A
Format: Article
Language:English
Subjects:
74.25.Dw
74.40.-n
74.72.Kf
Condensed Matter
Cuprates
Disorders
Fluctuation
Magnetic fields
Optimization
Phase diagrams
Physics
Superconductivity
Transport
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
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.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/91/37005