Quantum spin dynamics

Research group

Research theme

Sub department

About

Fermi-surface traversal resonance in alpha-(BEDT-TTF)(2)KHg(SCN)(4)

SYNTHETIC MET 103:1-3 (1999) 2038-2039

Authors:

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

Abstract:

We experimentally demonstrate a mechanism for a new kind of magnetic resonance, the Fermi-surface traversal resonance (FTR). This is caused by the periodic traversal of carriers across quasi-one-dimensional (Q1D) sections of Fermi surface (FS) in an external magnetic field. Owing to the warping of the Q1D Fermi sheets, the real space velocities of the carriers oscillate as they cross the FS, generating resonances in the high frequency conductivity of the material. The results contain information about the FS, including the direction and harmonic content of the warping components. Using a rotating resonant-cavity system, FTRs have been observed in alpha-(BEDT-TTF)(2)KHg(SCN)(4).
More details from the publisher

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.
More details from the publisher

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
More details from the publisher
More details

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
More details from the publisher
More details

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.
More details from the publisher
More details