Quantum spin dynamics

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Cyclotron resonance in the layered perovskite superconductor Sr2RuO4

(2002)

Authors:

Eva Rzepniewski, Rachel S Edwards, John Singleton, Arzhang Ardavan, Y Maeno
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Cyclotron resonance in the layered perovskite superconductor Sr2RuO4

JOURNAL OF PHYSICS-CONDENSED MATTER 14:14 (2002) PII S0953-8984(02)32816-9

Authors:

E Rzepniewski, RS Edwards, J Singleton, A Ardavan, Y Maeno
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Magneto-optics of organic crystalline field effect transistors

(2001)

Authors:

A Ardavan, SJ Blundell, J Singleton
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Superconducting properties and fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)2GaCl4 (BETS ≡ bis(ethylene-dithio)tetraselenafulvalene)

Journal of Physics Condensed Matter 13:36 (2001) 8325-8345

Authors:

C Mielke, J Singleton, MS Nam, N Harrison, CC Agosta, B Fravel, LK Montgomery

Abstract:

The 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.
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Thermal activation between Landau levels in the organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO 3

Physical Review Letters 87:11 (2001)

Authors:

MS Nam, A Ardavan, JA Symington, J Singleton, N Harrison, CH Mielke, JA Schlueter, RW Winter, GL Gard

Abstract:

Thermally activated conductivity at integer Landau-level filling factors in the Q2D organic metal β″-(BEDT-TTF)2SF5CH2CF2SO 3 was observed for the first time. The activation energies deduced from the conductivity showed good agreement with the Landau-level spacings once broadening is taken into consideration.