Magnetic-Field-Induced 1{sup st} order Transition to FFLO State at Paramagnetic Limit in 2D Superconductors.
We have recently reported the first direct calorimetric observation of a magnetic-field-induced first-order phase transition into a high-field FFLO superconducting state at the Clogston-Chandrasekar 'Pauli' paramagnetic limitH(p) in a 2D superconductor kappa - (BEDT-TTF)(2)Cu(NCS)(2). The high-field state is both higher entropy and strongly paramagnetic, as thermodynamically required for the FFLO state. Here we compare our results with theoretical predictions for the field dependence of the high-field FFLO state in the 2D limit, revealing tentative evidence for transitions between FFLO states of differing order parameter. We also present calorimetric evidence for a 1st order phase transition into the FFLO state for a second 2D organic superconductor: beta '' - (BEDT-TTF)(2)SF5(CH)(2)(CF)(2)(SO)(3).
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1495711
- Resource Relation:
- Conference: 28th International Conference on Low Temperature Physics, 08/09/17 - 08/16/17, Gothenburg, SE
- Country of Publication:
- United States
- Language:
- English
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