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- Title
Disentangling Cooper-pair formation above the transition temperature from the pseudogap state in the cuprates.
- Authors
Kondo, Takeshi; Hamaya, Yoichiro; Palczewski, Ari D.; Takeuchi, Tsunehiro; Wen, J. S.; Xu, Z. J.; Gu, Genda; Schmalian, Jörg; Kaminski, Adam
- Abstract
The discovery of the pseudogap in the cuprates created significant excitement as it was believed to be a signature of pairing, in some cases above room temperature. Indeed, a number of experiments detected phase-fluctuating superconductivity above the transition temperature Tc (refs 5, 6, 7 8, 9). However, several recent experiments reported that the pseudogap and superconducting state are characterized by different energy scales, and probably compete with each other, leaving open the question of whether the pseudogap is caused by pair formation. Here we report the discovery of a spectroscopic signature of pair formation and demonstrate that in a region commonly referred to as the pseudogap, two distinct states coexist: one that is due to pair formation and persists to an intermediate temperature Tpair<T* and a second-the 'proper' pseudogap-characterized by the loss of spectral weight and anomalies in transport properties that extends up to T*. Tpair has a value around 120-150 K even for materials with very different Tc values and it probably sets a limit on the highest attainable Tc in the cuprates.
- Subjects
PAIR production; COOPERS &; cooperage; TRANSITION temperature; SUPERCONDUCTIVITY; PHYSICS experiments
- Publication
Nature Physics, 2011, Vol 7, Issue 1, p21
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys1851