Quantum spin dynamics

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Millimetre-wave response of the novel organic superconductors β″-ET4[(H3O)M(C2O4)3 ].S (M=Fe3+, S= C6H5CN and C6H5NO2)

Synthetic Metals 137:1-3 (2003) 1225-1226

Authors:

A Narduzzo, A Ardavan, AI Coldea, J Singleton, A Akutsu-Sato, H Akutsu, SS Turner, P Day

Abstract:

The millimeter-wave response of the novel organic superconductors was studied. The magneto-optical response of the two samples containing Fe3+ ions and the host solvents benzonitrile and nitrobenzene. The angle dependence of the electron paramagnetic resonance (EPR) spectra and the anisotropy of the g-factors for the two materials were presented. The angle of dependence of the absorption spectra at 1.4 K for the two samples were compared.
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Harmonics of the cyclotron resonance in the organic superconductor beta-(BEDT-TTF)(2)IBr2

SYNTHETIC MET 133 (2003) 117-118

Authors:

RS Edwards, A Narduzzo, A Ardavan, J Singleton

Abstract:

Cyclotron resonance, along with several harmonies, has been observed in the magneto-optical response of the organic superconductor beta-(BEDT-TTF)(2)IBr2. We compare the effective mass obtained from magneto-optical experiments with previous magnetic quantum oscillation (thermodynamic) measurements. Other resonances observed in this sample have a different angular behaviour from cyclotron resonance; the origins of these resonances are discussed and compared with previous experiments. (C) 2002 Elsevier Science B.V. All rights reserved.
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Interplane corrugations in quasi-one-dimensional Fermi surface sections of deuterated and undeuterated kappa-(BEDT-TTF)(2)Cu(NCS)(2)

SYNTHETIC MET 133 (2003) 129-130

Authors:

A Narduzzo, RS Edwards, A Ardavan, J Singleton

Abstract:

Recently a small but definite isotope effect has been found on deuteration of the organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) [Physica C 351 (2000) 251]. We have investigated the alterations in band-structure brought about by deuteration using a millimetre-wave technique which is sensitive to the corrugations of the quasi-one-dimensional (Q1D) sheets of the Fermi surface [J. Phys. 13 (2001) 2235]. We have mapped the interplane corrugations of the Q1D Fermi surface sections and discuss the dependence of the warping components of these Q1D sheets on the deuteration. (C) 2002 Elsevier Science B.V. All rights reserved.
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Magneto-optics of organic crystalline field effect transistors

SYNTHETIC MET 133 (2003) 165-167

Authors:

A Ardavan, SJ Blundell, J Singleton

Abstract:

Organic molecular FETs provide an experimental framework for studying the band-filling dependent properties of two-dimensional metals. We propose experiments to investigate the band-filling dependent cyclotron resonance and the effect of van Hove singularities. (C) 2002 Elsevier Science B.V. All rights reserved.
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Possible Frohlich superconductivity in strong magnetic fields

SYNTHETIC MET 133 (2003) 99-102

Authors:

CH Mielke, N Harrison, A Ardavan, P Goddard, J Singleton, A Narduzzo, LK Montgomery, L Balicas, JS Brooks, M Tokumoto

Abstract:

A brief review of some of the arguments pointing towards the possibility of organic conductors of the form alpha-(BEDT-TTF)(2)MHg(SCN)(4) (where M = K, Tl and Rb) being candidates for Frohlich superconductivity is given. (C) 2002 Published by Elsevier Science B.V.
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