Charles Mielke et al 2001 J. Phys.: Condens. Matter 13 8325 doi:10.1088/0953-8984/13/36/308
Charles Mielke1,5, John Singleton1,2, Moon-Sun Nam2, Neil Harrison1, C C Agosta3, B Fravel4 and L K Montgomery4
Show affiliationsThe Fermi-surface topology of the organic superconductor λ-(BETS)2GaCl4 has been determined using the Shubnikov-de Haas and magnetic breakdown effects and angle-dependent magnetoresistance oscillations. The former experiments were carried out in pulsed fields of up to 60 T, whereas the latter employed quasistatic fields of up to 30 T. All of these data show that the Fermi-surface topology of λ-(BETS)2GaCl4 is very similar to that of the most heavily studied organic superconductor, κ-(BEDT-TTF)2Cu(NCS)2 (BEDT-TTF≡bis(ethylene-dithio)tetrathiafulvalene), except in one important respect: the interplane transfer integral of λ-(BETS)2GaCl4 is a factor ~5 larger than that of κ-(BEDT-TTF)2Cu(NCS)2. The increased three-dimensionality of λ-(BETS)2GaCl4 is manifested in radio-frequency penetration-depth measurements, which show a clear dimensional crossover in the behaviour of Hc2(T). The radio-frequency measurements have also been used to extract the Labusch parameter determining the fluxoid interactions as a function of temperature, and to map the flux-lattice melting curve.
Issue 36 (10 September 2001)
Received 3 April 2001, in final form 30 July 2001
Published 23 August 2001
Charles Mielke et al 2001 J. Phys.: Condens. Matter 13 8325
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