Quantum matter in high magnetic fields

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Electron paramagnetic resonance studies of the high-spin molecule Cr10 (OMe) 20 (O2 CCMe3) 10

Applied Physics Letters 86:3 (2005) 1-3

Authors:

S Sharmin, A Ardavan, SJ Blundell, AI Coldea, EJL Mcinnes, D Low

Abstract:

We report millimeter-wave magneto-optical measurements on the high-spin molecule, Cr10 (OMe) 20 (O2 CCMe3) 10. The dependence of the electron paramagnetic resonance as a function of orientation and temperature demonstrates that this compound behaves as a single molecule magnet, and exhibits one of the smallest zero-field splittings (D=-0.045±0.004 K) yet reported for such a system. © 2005 American Institute of Physics.
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Electron paramagnetic resonance studies of the high-spin molecule Cr10(OMe)20(O2CCMe3)10 -: art. no. 03250

APPLIED PHYSICS LETTERS 86:3 (2005) ARTN 032507

Authors:

S Sharmin, A Ardavan, SJ Blundell, AI Coldea, EJL McInnes, D Low
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Fermiology of new charge-transfer salts, β″-(BEDT-TTF) 4[(H3O)M(C2O4)3]-solvent where M = Ga, Cr and Fe

Journal De Physique. IV : JP 114 (2004) 205-209

Authors:

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

Abstract:

We report high-field magnetotransport measurements on β″-(BEDT- TTF)4[(H3O)M(C2O4) 3]· solvent, where M=Ga3+, Cr3+ and Fe3+ and solvent=C5H5N. In spite of their differing transition metal-ions, M, the three compounds exhibit similar magnetic quantum oscillation spectra superimposed on a positive magnetoresistance. At least four independent quantum oscillation frequencies have been identified, corresponding to two different hole and electron pockets of the Fermi surface which follow the rules of a compensated metal. Observation of the small pockets could be the result of the Fermi surface reconstruction induced by a possible density wave. The effective masses are very similar for different samples and for different pockets range between meff ≈ 0.5-1.1 me whereas the Dingle temperatures varies between TD ≈ 1.4-4 K. At low temperature, the longitudinal magnetoresistance violates Kohler's rule, suggesting that the interlayer transport in these quasi-2D systems cannot be related to a single scattering time and that the disorder plays an important role. © EDP Sciences.
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The effect of magnetic ions and disorder on superconducting β″-(BEDT-TTF)4[(H3O)M(C2O 4)3]· C6H5NO2 salts, where M = Ga and Cr

Journal De Physique. IV : JP 114 (2004) 285-287

Authors:

AF Bangura, AI Coldea, A Ardavan, J Singleton, A Akutsu-Sato, H Akutsu, P Day

Abstract:

We report magnetotransport measurements performed in magnetic fields of up to 33 T and at low temperatures (0.45 K
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The role of magnetic ions on the magnetotransport properties of the charge-transfer salts β″-BEDT-[()()] where =, Cr3+ or Fe3+

Journal of Magnetism and Magnetic Materials Elsevier BV 272-276 (2004) 1062-1064

Authors:

AI Coldea, AF Bangura, J Singleton, A Ardavan, A Akutsu-Sato, H Akutsu, S S. Turner, P Day
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