Superconducting Fluctuations and the Pseudogap in the Slightly Overdoped High- Tc Superconductor TlSr2CaCu2O6.8: High Magnetic Field NMR Studies
Guo-qing Zheng, H. Ozaki, W. G. Clark, Y. Kitaoka, P. Kuhns, A. P. Reyes, W. G. Moulton, T. Kondo, Y. Shimakawa, Y. Kubo
DOI 10.1103/PhysRevLett.85.405 · Physical Review Letters
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Abstract
From measurements of the 63Cu Knight shift ( K) and the nuclear spin-lattice relaxation rate ( 1/T1) under magnetic fields from zero up to 28 T in the slightly overdoped high- Tc superconductor TlSr2CaCu2O6.8 ( Tc=68K), we find that the pseudogap behavior, i.e., the reductions of 1/T1T and K above Tc from the values expected from the normal state at high T, is strongly field dependent and follows a scaling relation. We show that this scaling is consistent with the effects of the Cooper pair density fluctuations. The present finding contrasts sharply with the pseudogap property reported previously in the underdoped regime where no field effect was seen up to 23.2 T. The implications are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TlSr2CaCu2O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 68 | Pressure not reported | unknown |
| TlSr2CaCu2O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 68 | Pressure not reported | unknown |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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