Pressure-temperature phase diagram of the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]I
M. A. Tanatar, T. Ishiguro, S. Kagoshima, N. D. Kushch, E. B. Yagubskii
DOI 10.1103/PhysRevB.65.064516 · Physical Review B
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Abstract
The pressure-temperature phase diagram of the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]I determined by resistive measurements is presented. Under a hydrostatic pressure of about 1 kbar an insulating state is transformed into a metallic state, showing superconductivity with a transition temperature Tc up to 8 K. A resistivity maximum develops in the boundary region of insulator-metal transformation and its position gradually shifts to high temperatures with pressure. These properties of the salt are in line with the generic phase diagram for κ-phase materials, although the salt is located deep in the insulating domain of the phase diagram, contrary to the expectation based on the ionic radius of the halogen atom. We show the relation of the shape of the phase diagram to the degree of structural order in the material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2Cu[N(CN)2]I Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | 0.1 GPa | onset |
| (BEDT-TTF)2Cu[N(CN)2]I Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.7 | 0.1 GPa | midpoint |
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