Structural disorder and its effect on the superconducting transition temperature in the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br
X. Su, F. Zuo, J. A. Schlueter, M. E. Kelly, Jack M. Williams
DOI 10.1103/PhysRevB.57.R14056 · Physical Review B
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Abstract
In this paper, we report direct evidence of a structural transition in the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br near 80 K and the effect of disorder on the superconducting transition temperature. By cooling the sample from above 80 K, the interlayer magnetoresistance displays a bumplike feature, which increases sharply with increasing cooling rate. The rapidly cooled sample has a much larger resistivity and a lower transition temperature, which decreases linearly with increasing resistivity near the transition temperature. We propose that rapid cooling quenches the sample into a disordered state. Localized moments in the disordered state reduce the superconducting transition temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (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 | Pressure unresolved | unknown |
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | unknown |
| (BEDT-TTF)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | 0.03 GPa | unknown |
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