Magnetic field - temperature phase diagram of quasi-two-dimensional organic superconductor lambda-(BETS)2 GaCl4 studied via thermal conductivity
Abstract
The thermal conductivity kappa of the quasi-two-dimensional (Q2D) organic superconductor lambda-(BETS)2 GaCl4 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 kappa(H) at Hc2 parallel. In contrast in clean samples Hc2(T) shows no saturation towards low temperatures and the feature in kappa(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.
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