Determination of the Antiferroquadrupolar Order Parameters in UPd3
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 UPd_3. 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.
Cite
@article{arxiv.cond-mat/0610739,
title = {Determination of the Antiferroquadrupolar Order Parameters in UPd3},
author = {H. C. Walker and K. A. McEwen and D. F. McMorrow and S. B. Wilkins and F. Wastin and E. Colineau and D. Fort},
journal= {arXiv preprint arXiv:cond-mat/0610739},
year = {2007}
}
Comments
4 pages, 5 figures