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Determination of the antiferroquadrupolar order parameters in UPd3

Walker, HC; McEwen, KA; McMorrow, DF; Wilkins, SB; Wastin, F; Colineau, E; Fort, D; (2006) Determination of the antiferroquadrupolar order parameters in UPd3. PHYS REV LETT , 97 (13) , Article 137203. 10.1103/PhysRevLett.97.137203. Green open access

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Abstract

By combining accurate heat capacity and x-ray resonant scattering results we have resolved the long standing question regarding the nature of the quadrupolar ordered phases in UPd3. The order parameter of the highest temperature quadrupolar phase has been uniquely determined to be antiphase Q(zx) in contrast to the previous conjecture of Q(x)(2)-y(2). The azimuthal dependence of the x-ray scattering intensity from the quadrupolar superlattice reflections indicates that the lower temperature phases are described by a superposition of order parameters. The heat capacity features associated with each of the phase transitions characterize their order, which imposes restrictions on the matrix elements of the quadrupolar operators.

Type: Article
Title: Determination of the antiferroquadrupolar order parameters in UPd3
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.97.137203
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.97.137203
Language: English
Additional information: © 2006 The American Physical Society
Keywords: X-RAY SUSCEPTIBILITY, PHASE-TRANSITIONS, QUADRUPOLAR, CRYSTALS, SYSTEM, REFLECTIONS, SCATTERING, FIELD
URI: http://discovery.ucl.ac.uk/id/eprint/9761
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