Angle dependence of the upper critical field in the layered organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) (BEDT-TTF equivalent to bis(ethylene-dithio)tetrathiafulvalene)

Angle dependence of the upper critical field in the layered organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) (BEDT-TTF equivalent to bis(ethylene-dithio)tetrathiafulvalene)

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...

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Bibliographic Details
Main Authors: Nam, MS, Symington, J, Singleton, J, Blundell, S, Ardavan, A, Perenboom, J, Kurmoo, M, Day, P
Format: Journal article
Language:English
Published: 1999
Description
Summary: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.

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