Superconductor-insulator phase transformation of partially deuterated κ−(BEDT−TTF)2Cu[N(CN)2]Br by control of the cooling rate
H. Taniguchi, A. Kawamoto, K. Kanoda
DOI 10.1103/PhysRevB.59.8424 · Physical Review B
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Abstract
The electronic state of κ−(BEDT−TTF)2Cu[N(CN)2]Br is precisely controlled around the superconductor-insulator boundary by partial deuteration. As the salt approaches the boundary with progressive deuteration, the cooling rate influences the electronic state strongly; the low-temperature metallic phase is transformed into the insulating phase with collapse of the bulk superconductivity by the rapid cooling. This phenomenon is discussed in terms of the change in U/W and the possible effect of the disorder on the metallic (superconducting) phase near the Mott insulator, where U and W are the intradimer Coulomb repulsion and the bandwidth.
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. | 11.5 | Pressure not reported | onset |
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.5 | Pressure not reported | onset |
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