Relation between cuprate superconductivity and magnetism: A Raman study of (CaLa)1(BaLa)2Cu3Oy
Dirk Wulferding, Meni Shay, Gil Drachuck, Rinat Ofer, Galina Bazalitsky, Zaher Salman, Peter Lemmens, Amit Keren
DOI 10.1103/PhysRevB.90.104511 · Physical Review B
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Abstract
We present an investigation of charge-compensated antiferromagnetic (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy single crystals using Raman scattering as well as muon spin rotation. In this system the parameter x controls the Cu-O-Cu superexchange interaction via bond distances and buckling angles. The oxygen content y controls the charge doping. In the absence of doping the two-magnon peak position is directly proportional to the superexchange strength J. We find that both x and y affect the peak position considerably. The Néel temperature determined from muon spin rotation on the same samples independently confirms the strong dependence of the magnetic interaction on x and y. We find a considerable increase in the maximum superconducting transition temperature Tcmax with J. This is strong evidence of the importance of orbital overlap to superconductivity in this family of cuprates.
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. | — | Pressure not reported | unknown |
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