Quantum spin dynamics: publications

Cyclotron resonance harmonics in the organic superconductor $\beta^{\prime\prime}$-(BEDT-TTF)$_2$SF$_5$CH$_2$CF$_2$SO$_3$; observation of a new kind of effective mass renormalization

(2001)

Authors:

RS Edwards, JA Symington, A Ardavan, J Singleton, E Rzepniewski, RD McDonald, J Schlueter, AM Kini

Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor $\kappa$-(BEDT-TTF)$_2$Cu(NCS)$_2$

(2001)

Authors:

J Singleton, JA Symington, M-S Nam, A Ardavan, M Kurmoo, P Day

Thermal activation between Landau levels in the organic superconductor $\beta''$-(BEDT-TTF)$_{2}$SF$_{5}$CH$_{2}$CF$_{2}$SO$_{3}$

(2001)

Authors:

M-S Nam, A Ardavan, JA Symington, J Singleton, N Harrison, CH Mielke, JA Schlueter, RW Winter, GL Gard

Test for interlayer coherence in a quasi-two-dimensional superconductor

(2001)

Authors:

John Singleton, PA Goddard, A Ardavan, N Harrison, SJ Blundell, JA Schlueter, AM Kini

A quantum-mechanical model of quasi-one-dimensional conductors

SYNTHETIC MET 120:1-3 (2001) 1009-1010

Authors:

A Ardavan, J Singleton, SJ Blundell

Abstract:

We present a model of a quasi-one-dimensional (Q1D) conductor with weak dispersion in the direction perpendicular to the chains in a magnetic field. Finite-energy electric dipole transitions between the eigenstates of the system constitute Fermi-surface traversal resonance, a Q1D analogue of cyclotron resonance. We extend the model to describe a (TMTSF)(2)X-like material, with dispersion in two directions perpendicular to the chains, and find that for certain orientations of the magnetic field large degeneracies occur between the magnetic-field induced states. These are angles at which maxima are observed experimentally in the d.c. conductivity, and thus we explain one class of angle-dependent magnetoresistance oscillations (AMRO) in terms of zero-energy electric dipole transitions between magnetic-field induced states.

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