Quantum spin dynamics

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Millimetre-wave response of the organic superconductor kappa-(BEDT-TTF)(2)Cu(SCN)(2)

SYNTHETIC MET 103:1-3 (1999) 1947-1948

Authors:

JM Schrama, A Ardavan, J Singleton, SJ Blundell, W Hayes, M Kurmoo, P Day

Abstract:

A study of the electronic and superconducting properties of the organic superconductor kappa-(BEDT-TTF)(2)Cu(SCN)(2) in the millimetre-wave range is presented. The measurments are carried out using a single crystal in an unique rotating rectangular cavity. This novel technique provides information about the anisotropy of the magnetoresistance at GHz freqencies.
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One-and two-dimensional angle-dependent magnetoresistance oscillations(AMROs) in κ-(BEDT-TTF)2Cu(SCN)2 in fields of up to 33 T

Synthetic Metals Elsevier 103:1-3 (1999) 1905-1906

Authors:

M-S Nam, MM Honold, C Proust, N Harrison, CH Mielke, SJ Blundell, J Singleton, W Hayes, M Kurmoo, P Day
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Pulsed-magnetic-field measurements of Hall potential oscillations in α-(BEDT-TTF)2TlHg(SCN)4 within the quantum Hall regime

Physical Review B American Physical Society (APS) 59:16 (1999) r10417-r10420

Authors:

MM Honold, N Harrison, J Singleton, M-S Nam, SJ Blundell, CH Mielke, MV Kartsovnik, ND Kushch
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Quantum-mechanical model of fermi-surface traversal resonance

Physical Review B - Condensed Matter and Materials Physics 60:23 (1999) 15500-15503

Authors:

A Ardavan, SJ Blundell, J Singleton

Abstract:

We describe a quantum-mechanical model of Fermi-surface traversal resonance (FTR), a magneto-optical resonance that occurs in quasi-one-dimensional metals. We show that the predictions of this model are in quantitative agreement with earlier semiclassical models of FTR. The agreement between the two approaches, whose starting assumptions are very different, demonstrates that it is a fundamental property of quasi-one-dimensional systems. © 1999 The American Physical Society.
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Fermi surface traversal resonance in metals: Two theories and an experiment

P SOC PHOTO-OPT INS 3828 (1999) 366-377

Authors:

A Ardavan, JM Schrama, SJ Blundell, J Singleton, A Semeno, P Goy, M Kurmoo, P Day

Abstract:

Fermi-surface traversal resonance (FTR) is caused by the periodic motion of carriers in a magnetic field across open sections of Fermi surface (FS). Owing to the warping of the FS, the real space velocities of the carriers oscillate, generating resonances in the high frequency conductivity which may be described by a semiclassical model. A rectangular resonant cavity, oscillating at 70 GHz, which can rotate in the external magnetic field, has been used to confirm the existence of the effect in the organic metal alpha-(BEDT-TTF)(2)KHg(SCN)(4). The data contain a great deal of information about the FS, including the direction and anharmonicity of warping components. A quantum mechanical model is presented which predicts all of the features of FTR appearing in the semiclassical model. This confirms that FTR is a fundamental property of few-dimensional systems, existing under a very wide range of conditions.
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