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Magnetotransport measurements on beta ''-(BEDT-TTF)(4)[(H3O)Ga3+(C2O4)(3)](center dot) C6N5NO2

SYNTHETIC MET 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 beta"-(BEDT-TTF)(4)[(H3O) Ga3+ (C2O4)(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 T. 7.5 K and an in-plane critical field B-c2 greater than or equal to 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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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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