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Hattori, Kazumasa and Tsunetsugu, Hirokazu (2014). Antiferro Quadrupole Orders in Non-Kramers Doublet Systems. J. Phys. Soc. Jpn., 83 (3). TOKYO: PHYSICAL SOC JAPAN. ISSN 0031-9015

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Abstract

We investigate antiferro quadrupole orders in systems with non-Kramers doublet ground state with total angular momentum J = 4 in T-d point group symmetry. We demonstrate that a pure O-2(2) antiferro quadrupole order is impossible in general crystalline-electric field potential and should be accompanied by ferro O-2(0) quadrupole moment. The temperature and magnetic-field phase diagram is obtained by mean-field approximation of intersite quadrupole interactions and the excitation spectrum is analyzed by spin-wave approximations. Gapless excitations emerge at the boader of antiferro O-2(2) quadrupole phases under magnetic field. Quadrupole susceptibilities in the antiferro quadrupole ordered state exhibit unusual singularity and especially the uniform quadrupole susceptibility diverges in addition to the staggered ones. These unusual singularities are also realized at the critical field along [111] direction. We also discuss recent experimental results in PrT2X20 (T = Ir, Rh, Ti, V, and X = Zn, Al).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hattori, Kazumasa UNSPECIFIED UNSPECIFIED UNSPECIFIED Tsunetsugu, Hirokazu UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-444988
DOI:	10.7566/JPSJ.83.034709
Journal or Publication Title:	J. Phys. Soc. Jpn.
Volume:	83
Number:	3
Date:	2014
Publisher:	PHYSICAL SOC JAPAN
Place of Publication:	TOKYO
ISSN:	0031-9015
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EXCITATIONS Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44498