M-S Nam et al 1999 J. Phys.: Condens. Matter 11 L477 doi:10.1088/0953-8984/11/43/102
Angle dependence of the upper critical field in the layered organic superconductor 
-(BEDT-TTF)2Cu(NCS)2 (BEDT-TTF
bis(ethylene-dithio)tetrathiafulvalene)
M-S Nam
, J A Symington, J Singleton, S J Blundell, A Ardavan, J A A J Perenboom
, M Kurmoo§ and P Day||
LETTER TO THE EDITOR
We have performed detailed studies of the angle- and temperature-dependent resistive upper critical fields in the layered organic superconductor -(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 -(BEDT-TTF)2Cu(NCS)2.
- PACS
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74.70.Kn Organic superconductors
74.20.Rp Pairing symmetries (other than s-wave)
- Subjects
- Dates
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Issue 43 (1 November 1999)
Received 15 July 1999
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Angle dependence of the upper critical field in the layered organic superconductor -(BEDT-TTF)2Cu(NCS)2 (BEDT-TTF bis(ethylene-dithio)tetrathiafulvalene)
M-S Nam et al 1999 J. Phys.: Condens. Matter 11 L477
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