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Magnetotransport measurements on β"-(BEDT-TTF)4[(H3O)Ga3+(C2 O4)3]. C6H5NO2

Synthetic Metals 137:1-3 (2003) 1313-1314

Authors:

AF Bangura, AI Coldea, J Singleton, A Ardavan, AK Klehe, A Akutsu-Sato, H Akutsu, SS Turner, P Day

Abstract:

Transport measurements have been carried out on single crystals of the charge transfer salt β″-(BEDT-TTF)4[(H3O)Ga3+(C2 O4)3]. C6H5NO2, using magnetic fields of up to 33 T and temperatures down to 0.55 K. The material is found to be superconducting with Tc ≈ 7.5 K and an in-plane critical field Bc2 ≥ 33 T, and to exhibit Shubnikov-de Haas (SdH) oscillations. The temperature and angle dependence of the Shubnikov-de Haas oscillations and the upper critical field are reported, allowing information about the anisotropy of the upper critical field, effective mass m*, and the Fermi-surface (FS) of the material to be deduced.
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Millimetre-wave response of the novel organic superconductors beta ''-ET4[(H3O)M(C2O4)(3)]center dot S (M=Fe3+, S=C6H5CN and C6H5NO2)

SYNTHETIC MET 137:1-3 (2003) 1225-1226

Authors:

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

Abstract:

The high frequency (f=70 GHz) magneto-optical response of beta"-ET4[(H3O)M(C2O4)(3)].S, where M=Fe3+, S=C6H5CN and C6H5NO2, has been investigated in the temperature range 1.4 K < T < 120 K. The angle dependence of the EPR spectra and the anisotropy of the g-factors for the two materials are presented.
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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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