Competition between magnetism and superconductivity in the organic metal κ−[BEDT−TTF]2Cu[N(CN)2]Br
David Fournier, Mario Poirier, Kim Doan Truong
DOI 10.1103/PhysRevB.76.054509 · Physical Review B
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Abstract
Ultrasonic velocity and attenuation measurements on the quasi-two-dimensional organic conductor κ−[BEDT−TTF]2Cu[N(CN)2]Br give the first determination of the coexistence zone of the antiferromagnetic and superconducting phases, which extends deep in the metallic part of the pressure-temperature phase diagram of these salts. This zone is identified from a precise control of the thermal cycle, which seems to act as an internal pressure. The two phases are found to compete, whereas superconducting fluctuations begin to contribute to the attenuation at 15K, namely, at the onset of magnetic order that is well above the superconducting transition temperature Tc=11.9K. Finally, the temperature profile of sound attenuation for both longitudinal and transverse phonon polarizations is found to be inconsistent with a conventional s-wave order parameter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.9 | Pressure unresolved | onset |
| κ-(BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.9 | Pressure unresolved | onset |
| κ-(BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.9 | Pressure unresolved | unknown |
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