Muons and magnets

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Magnetism in the S=1 frustrated antiferromagnet Ge Ni2 O4 studied using implanted muons

Physical Review B - Condensed Matter and Materials Physics 73:18 (2006)

Authors:

T Lancaster, SJ Blundell, D Prabhakaran, PJ Baker, W Hayes, FL Pratt

Abstract:

We present the results of a muon-spin relaxation study of Ge Ni2 O4. We provide further clarification of the two transitions to the antiferromagnetic state and measure the magnetic field dependence of the heat capacity up to 14 T. Both oscillatory and relaxing signals are observed below the lower transition (at temperature TN2) in the muon-decay positron asymmetry spectra, arising from two distinct types of magnetic environment. A possible explanation is suggested in terms of the separate ordering of two magnetic subsystems, one of which does not order fully down to the lowest measured temperature (1.8 K). © 2006 The American Physical Society.
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Low-Temperature Spin Diffusion in a Highly Ideal S=1/2 Heisenberg Antiferromagnetic Chain Studied by Muon Spin Relaxation

Physical Review Letters 96 (2006) 247203 4pp

Authors:

SJ Blundell, C Baines, F L Pratt, T Lancaster
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Effect of Irradiation-Induced Disorder on the Conductivity and Critical Temperature of the Organic Superconductor k-(BEDT-TTF)2Cu(SCN)2

Physical Review Letters 96 (2006) 177002 4pp

Authors:

SJ Blundell, A. Ardavan, J.F. Analytis, R.L. Owen
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Muon-spin relaxation study of the spin-(1)(2) molecular chain compound Cu(HCO2)(2)(C4H4N2)

Physical Review B: Condensed Matter and Materials Physics 73 (2006) 172403 (4 pages)

Authors:

T Lancaster, S. J. Blundell, M. L. Brooks, P. J. Baker
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A mu SR study of the metamagnetic phase transition in the electron-transfer salt [FeCp2*][TCNQ]

PHYSICA B 374 (2006) 114-117

Authors:

SJ Blundell, T Lancaster, ML Brooks, FL Pratt, ML Taliaferro, JS Miller

Abstract:

We have used muon-spin rotation (mu SR) to study the metamagnetic transition in [FeCp2*][TCNQ] where Cp* = C5Me5 and TCNQ is 7,7,8,8-tetracyano-p-quinodimethane. This electron-transfer salt contains parallel chains of alternating [FeCp2*](+) cations and [TCNQ](-) anions. Our zero-field mu SR data show the 2.5 K transition and show that a static, but disordered, internal field distribution develops below this. High-transverse-field mu SR has also been used to study the metamagnetic transition and the data illustrate how the internal field distribution changes through this transition. (c) 2005 Elsevier B.V. All rights reserved.
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