17 O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (Cax La1-x)(Ba1.75-x La0.25+x) Cu3 Oy

T. Cvitanić, D. Pelc, M. PoŽek, E. Amit, A. Keren

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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.

Original languageEnglish (US)
Article number054508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number5
DOIs
StatePublished - Aug 12 2014

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