Mott Transition, Compressibility Divergence, and the P−T Phase Diagram of Layered Organic Superconductors: An Ultrasonic Investigation
D. Fournier, M. Poirier, M. Castonguay, K. D. Truong
DOI 10.1103/PhysRevLett.90.127002 · Physical Review Letters
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Abstract
The phase diagram of the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Cl has been investigated by ultrasonic velocity measurements under helium gas pressure. Different phase transitions were identified through several elastic anomalies characterized from isobaric and isothermal sweeps. Our data reveal two crossover lines that end on the critical point terminating the first-order Mott transition line. When the critical point is approached along these lines, we observe a dramatic anomaly of the sound velocity which is consistent with a diverging compressibility of the electronic degrees of freedom.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(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 | 0.027 GPa | onset |
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