17O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy
T. Cvitanić, D. Pelc, M. Požek, E. Amit, A. Keren
DOI 10.1103/PhysRevB.90.054508 · Physical Review B
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Abstract
We report systematic 17O-NMR measurements on the high-Tc cuprate (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy, for four different families (different x). Using Knight shift data, we show that the pseudogap opening temperature T* is much higher than Tc near optimal doping, unlike structurally similar YBCO. In addition, at constant doping the pseudogap temperature does not vary with x, in contrast to Tc. This puts constraints on the nature of the pseudogap and position of the quantum critical point inside the superconducting dome.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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