Breakdown of the universal Josephson relation in spin-ordered cuprate superconductors
A. A. Schafgans, C. C. Homes, G. D. Gu, Seiki Komiya, Yoichi Ando, D. N. Basov
DOI 10.1103/PhysRevB.82.100505 · Physical Review B
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Abstract
We present c-axis infrared optical data on a number of Ba-, Sr-, and Nd-doped cuprates of the La2CuO4 (La214) series in which we observe significant deviations from the universal Josephson relation linking the normal-state transport (dc conductivity σdc measured at Tc) with the superfluid density (ρs): ρs∝σdc(Tc). We find the violation of Josephson scaling is associated with striking enhancement of the anisotropy in the superfluid density. The data allow us to link the breakdown of Josephson interlayer physics with the development of magnetic order in the CuO2 planes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.85-yNdySr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.875Ba0.125CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | onset |
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