17O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (Ca_xLa_1−x)(Ba_1.75−xLa_0.25+x)Cu_3O_y

Cvitanić, Tonči and Pelc, Damjan and Požek, Miroslav and Amit, E. and Keren, A. (2014) 17O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (Ca_xLa_1−x)(Ba_1.75−xLa_0.25+x)Cu_3O_y. Physical Review B, 90 (5). pp. 54508-5. ISSN 1098-0121

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Abstract

We report systematic 17O-NMR measurements on the high-Tc cuprate (Ca_xLa_1−x )(Ba_1.75−xLa_0.25+x )Cu_3O_y , 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.

Item Type: Article
Keywords: superconductivity, cuprates, pseudogap, NMR
Date: August 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2014) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: IP-2013-11-2729
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 28 Aug 2014 15:48
Last Modified: 22 Feb 2016 14:13
URI: http://digre.pmf.unizg.hr/id/eprint/2558

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