Quantum spin dynamics

Research group

Research theme

Sub department

About

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 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.
More details from the publisher

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
More details from the publisher

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.
More details from the publisher

Fermi surface spectroscopy: a magnetic resonance approach

PHYSICA B 280:1-4 (2000) 281-282

Authors:

JM Schrama, SO Hill, J Singleton, A Ardavan, E Rzepniewski, R Edwards

Abstract:

We describe recently-developed GHz magneto-optical techniques which measure the Fermi-surface topologies and superconducting order parameter symmetry in organic molecular metals. (C) 2000 Elsevier Science B.V. All rights reserved.
More details from the publisher

Halides of BET-TTF: Novel hydrated molecular metals

Advanced Materials 12:1 (2000) 54-58

Authors:

E Laukhina, E Ribera, J Vidal-Gancedo, S Khasanov, L Zorina, R Shibaeva, E Canadell, V Laukhin, M Honold, MS Nam, J Singleton, J Veciana, C Rovira

Abstract:

A new family of hydrated molecular metals based on the bis(ethylenethio- tetrathiafulvalene) (BET-TTF) donor was developed. A metal stable down to 0.5 K was obtained for the first time from this donor, perhaps due to the absence of disorder in the peripheral sulfur atoms. A hint of superconducting transition in some crystals of the BET-TTF2Br·3H2O salt was observed.
More details from the publisher