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Relevance of magnetism to cuprate superconductivity: Lanthanides versus charge-compensated cuprates

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journal contribution
posted on 12.05.2022, 04:52 by A Keren, W Crump, Benjamin MallettBenjamin Mallett, Shen ChongShen Chong, I Keren, H Luetkens, Jeffery TallonJeffery Tallon
We address what seemed to be a contradiction between the lanthanide series REBa2Cu3Oy (RE123) and the charge-compensated series (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy (CLBLCO) regarding the superexchange (J) dependence of the maximum superconductivity (SC) critical temperature Tcmax(J); RE and x are implicit variables. This is done by measuring the Neél temperature and the temperature dependence of the magnetic order parameter for RE = Nd, Sm, Eu, Gd, Dy, Yb, Y, and for Y(BaSr)Cu3Oy, at various very light dopings. The doping is determined by thermopower and the magnetic properties by muon spin rotation. We find that the normalized-temperature dependence of the order parameter is identical for all RE123 in the undoped limit (with the exception of Gd123) implying identical out-of-plane magnetic coupling. The extrapolation of TN to zero doping suggests that, despite the variations in ionic radii, J varies too weakly in this system to test the relation between SC and magnetism. This stands in contrast to CLBLCO, where both Tcmax and TNmax vary considerably in the undoped limit and a positive correlation between the two quantities was observed.

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Preferred citation

Keren, A., Crump, W., Mallett, B. P. P., Chong, S. V., Keren, I., Luetkens, H. & Tallon, J. L. (2019). Relevance of magnetism to cuprate superconductivity: Lanthanides versus charge-compensated cuprates. Physical Review B, 100(14), 144512-. https://doi.org/10.1103/PhysRevB.100.144512

Journal title

Physical Review B

Volume

100

Issue

14

Publication date

23/10/2019

Pagination

144512

Publisher

American Physical Society (APS)

Publication status

Published

Online publication date

23/10/2019

ISSN

2469-9950

eISSN

2469-9969

Article number

144512

Language

en

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