Two Pseudogaps in the Cuprates: Meingast et al. Reply

In classical superconductors Cooper-pair formation and phase coherence occur simultaneously as the temperature is lowered below Tc. In high-temperature superconductors (HTSC), on the other hand, the small superfluid density and low associated phase stiffness of the superconducting condensate are exp...

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Bibliographic Details
Published in:arXiv.org 2003-07
Main Authors: Meingast, C, Pasler, V, Nagel, P, Rykov, A, Tajima, S, Olsson, P
Format: Article
Language:English
Subjects:
Cooper pairs
Cuprates
Fluids
High temperature superconductors
Phase coherence
Phase transitions
Stiffness
Superconductors
Superfluidity
Temperature
Thermal expansion
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Summary:In classical superconductors Cooper-pair formation and phase coherence occur simultaneously as the temperature is lowered below Tc. In high-temperature superconductors (HTSC), on the other hand, the small superfluid density and low associated phase stiffness of the superconducting condensate are expected to lead to a separation of the Cooper-pair formation and the phase-coherence temperatures, especially in underdoped materials [3]. The only real phase transition in this scenario is the 3d-XY phase-ordering transition at Tc [3,4]. In our Letter [2] we showed that Tc in underdoped and optimally doped YBCO is just such a phase-ordering temperature, and then the question naturally arises - where do the Cooper pairs form? The observed 3d-XY scaling of our thermal expansion data over a wide temperature range [2] suggests that pairing occurs at temperatures considerably above Tc, and it thus appeared quite natural for us to associate the opening of the pseudogap at T*.
ISSN:2331-8422
DOI:10.48550/arxiv.0307203