Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor k-(BEDT-TTF)2Cu(NCS)2 (BEDT-TTF bis(ethylene-dithio)tetrathiafulvalene)
JOURNAL OF PHYSICS-CONDENSED MATTER 12:40 (2000) L641-L648
Angle dependence of the upper critical field in the layered organic superconductor kappa-(BEDT-TTF)2Cu(NCS)2 (BEDT-TTFequiv bis(ethylene-dithio)tetrathiafulvalene)
Journal of Physics Condensed Matter IOP Publishing 11:43 (1999) l477
Angle dependence of the upper critical field in the layered organic superconductor κ-(BEDT-TTF)2 Cu(NCS)2 (BEDT-TTF ≡ bis(ethylene-dithio)tetrathiafulvalene)
Journal of Physics Condensed Matter 11:43 (1999)
Abstract:
We have performed detailed studies of the angle- and temperature-dependent resistive upper critical fields in the layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2. With the magnetic field lying in the conducting planes, our measurements show an upper critical field which comfortably exceeds the Pauli-paramagnetic limit in this material. We find no azimuthal angle dependence of the critical field, in spite of recent evidence that this material has gap nodes characteristic of d-wave superconductivity. We propose that the large critical fields may be due to a Fulde-Ferrell-Larkin-Ovchinnikov state which can exist in exactly in-plane fields because of the nature of the Fermi surface of κ-(BEDT-TTF)2Cu(NCS)2. © 1999 IOP Publishing Ltd.ESR investigation of the low temperature state in alpha-(BEDT-TTF)(2)KHg(SCN)(4)
SYNTHETIC MET 103:1-3 (1999) 1949-1950
Abstract:
We have performed ESR measurements on an alpha-(BEDT-TTF)(2)KHg(SCN)(4) Single crystal at temperatures down to 0.9 K. Two regions where the ESR intensity decreases were observed. One corresponds to the proposed SDW transition (T approximate to 9 K); the other takes place at T less than or equal to 2 K. A new resonance line appears below the transition temperature T approximate to 9 K; its intensity grows continuously as the temperature is lowered. We regard the decrease of the ESR line at very low temperatures as evidence of a further phase transition.Fermi-surface traversal resonance in alpha-(BEDT-TTF)(2)KHg(SCN)(4)
SYNTHETIC MET 103:1-3 (1999) 2038-2039