Professor Stephen Blundell: Publications

Chiral-like critical behavior in the antiferromagnet cobalt glycerolate.

Phys Rev Lett 99:1 (2007) 017202

Authors:

FL Pratt, PJ Baker, SJ Blundell, T Lancaster, MA Green, M Kurmoo

Abstract:

Critical exponents closely matching those of the N=2 chiral universality class have been obtained for the layered magnetic system cobalt glycerolate using muon spin relaxation. This class was originally introduced to represent geometrically frustrated triangular stacked-layer XY magnets with chiral noncollinear spin structures. Since the present magnetic system is a canted XY system without geometrical frustration or chiral degeneracy, the results indicate that the order parameter for canting in this system plays a similar role to the chiral order parameter in the geometrically frustrated systems, strongly suggesting that both types of noncollinear system share the same universality class.

Molecular Magnetism

ChemInform Wiley 38:23 (2007) no-no

Magnetism in geometrically frustrated YMnO_3 under hydrostatic pressure studied with muon spin relaxation

Physical Review Letters 98 (2007) 197203 4pp

Authors:

T Lancaster, S. J. Blundell, D. Andreica, M. Janoschek

Magnetism in the high-Tc analogue Cs2AgF4 studied with muon-spin relaxation

(2007)

Authors:

T Lancaster, SJ Blundell, PJ Baker, W Hayes, SR Giblin, SE McLain, FL Pratt, Z Salman, EA Jacobs, JFC Turner, T Barnes

Separation of energy scales in the kagome antiferromagnet TmAgGe: A magnetic-field-orientation study up to 55 T

Physical Review B - Condensed Matter and Materials Physics 75:9 (2007)

Authors:

PA Goddard, J Singleton, AL Lima Sharma, E Morosan, SJ Blundell, SL Bud'ko, PC Canfield

Abstract:

TmAgGe is an antiferromagnet in which the spins are confined to distorted kagome-like planes at low temperatures. We report angle-dependent measurements of the magnetization M in fields of up to 55 T that show that there are two distinct and separate energy scales present in TmAgGe, each responsible for a set of step-like metamagnetic transitions: weak exchange interactions and strong crystalline-electric-field (CEF) interactions. Simulations of M using a three-dimensional, free-energy minimization technique allow us to specify the physical origin of the metamagnetic transitions in low, in-plane fields. We also show that the transitions observed with the field perpendicular to the kagome planes are associated with the CEF-split multiplet of Tm. © 2007 The American Physical Society.

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