Quantum spin dynamics

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Fermi surface shape and angle-dependent magnetoresistance oscillations

JOURNAL OF PHYSICS-CONDENSED MATTER 13:10 (2001) 2271-2279

Authors:

MS Nam, SJ Blundell, A Ardavan, JA Symington, J Singleton

Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 (BEDT-TTF=bis(ethylene-dithio)tetrathiafulvalene)

Journal of Physics Condensed Matter IOP Publishing 12:40 (2000) l641

Authors:

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

Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 (µþ·¡¶Ù°Õ-°Õ°Õ¹ó≡b¾±²õ(±ð³Ù³ó²â±ô±ð²Ô±ð-»å¾±³Ù³ó¾±´Ç)³Ù±ð³Ù°ù²¹³Ù³ó¾±²¹´Ú³Ü±ô±¹²¹±ô±ð²Ô±ð)

Journal of Physics Condensed Matter 12:40 (2000)

Authors:

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

Abstract:

Single crystals of the quasi-two-dimensional organic type II superconductor, κ-(BEDT-TTF)2Cu(NCS)2, have been studied in magnetic fields of up to 33 T and at temperatures between 0.5 K and 11 K using a compact differential susceptometer. When the magnetic field lies precisely in the quasi-two-dimensional planes of the material, there is strong evidence for a phase transition from the superconducting mixed state into a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, manifested as a change in the rigidity of the vortex system. The behaviour of the transition as a function of temperature is in good agreement with theoretical predictions.

A Vector Analyzer for Observing Millimeter-Submillimeter Resonances

Institute of Electrical and Electronics Engineers (IEEE) (2000) 1-4

Authors:

P Goy, S Caroopen, M Gross, A Ardavan, R Edwards, E Rzepniewski, J Singleton

Director fluctuations in a nematic liquid crystal probed using ALC spectroscopy

PHYSICA B 289 (2000) 612-615

Authors:

BW Lovett, JS Stiessberger, SJ Blundell, A Ardavan, IM Marshall, FL Pratt, ID Reid

Abstract:

We have investigated the molecular dynamics in the nematic liquid crystal 5CB using the ALC mu SR technique. Our measurements are consistent with a change in the amplitude of director fluctuations at the nematic-isotropic transition and we develop a model to describe this. (C) 2000 Elsevier Science B.V. All rights reserved.