Magnetic field–temperature phase diagram of the quasi-two-dimensional organic superconductor λ−(BETS)2GaCl4 studied via thermal conductivity
M. A. Tanatar, T. Ishiguro, H. Tanaka, H. Kobayashi
DOI 10.1103/PhysRevB.66.134503 · Physical Review B
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Abstract
The thermal conductivity κ of the quasi-two-dimensional (Q2D) organic superconductor λ−(BETS)2GaCl4 [BETS = bis(ethylenedithio)tetraselenfulvalene] was studied in the magnetic field H applied parallel to the Q2D plane. The phase diagram determined from this bulk measurement shows notable dependence on the sample quality. In dirty samples the upper critical field Hc2 is consistent with the Pauli paramagnetic limiting, and a sharp change is observed in κ(H) at Hc2‖. In contrast, in clean samples Hc2(T) shows no saturation towards low temperatures and the feature in κ(H) is replaced by two slope changes reminiscent of second-order transitions. The peculiarity was observed below ∼0.33Tc and disappeared on field inclination to the plane when the orbital suppression of superconductivity became dominant. This behavior is consistent with the formation of a superconducting state with spatially modulated order parameter in clean samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | Pressure not reported | midpoint |
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | Pressure not reported | onset |
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