Unusual behavior in the upper critical magnetic fields of the ambient-pressure organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br [where BEDT-TTF represents bis(ethylenedithio)tetrathiofulvalene]
W. K. Kwok, U. Welp, K. D. Carlson, G. W. Crabtree, K. G. Vandervoort, H. H. Wang, A. M. Kini, J. M. Williams, D. L. Stupka, L. K. Montgomery, J. E. Thompson
DOI 10.1103/PhysRevB.42.8686 · Physical Review B
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Abstract
We report a determination of the temperature dependence of the upper critical magnetic fields Hc2 for κ-(BEDT-TTF)2Cu[N(CN)2]Br, with the use of dc-magnetization measurements that show a well-defined diamagnetic onset. We find large slopes of -20 T/K and -2.2 T/K for H∥ac and H∥b, respectively, which lead to coherence lengths of 37 and 4 Å. There is unusual structure in the critical fields and a possible dimensional crossover at T/Tc∼0.97 for H∥ac. Neither the slopes nor the structure are observable in the superconducting transition measured by ac magnetoresistance, which exhibits strong magnetic-field broadening similar to that of the high-Tc copper oxide superconductor YBa2Cu3O7−δ. We find a strong depression of Tc, as large as 1.2 K, when the sample is rapidly cooled.
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. | 11.6 | Pressure unresolved | onset |
| (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. | 10.8 | Pressure unresolved | unknown |
| (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. | 9.6 | Pressure unresolved | unknown |
| (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. | 12.5 | Pressure unresolved | onset |
| (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. | 10.5 | Pressure unresolved | zero_resistance |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (BEDT-TTF)2Cu(NCS)2 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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