Universität zu Köln

Breunig, O., Garst, M., Sela, E., Buldmann, B., Becker, P., Bohaty, L., Mueller, R. and Lorenz, T. (2013). Spin-1/2 XXZ Chain System Cs2CoCl4 in a Transverse Magnetic Field. Phys. Rev. Lett., 111 (18). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Comparing high-resolution specific heat and thermal expansion measurements to exact finite-size diagonalization, we demonstrate that Cs2CoCl4 for a magnetic field along the crystallographic b axis realizes the spin-1/2 XXZ chain in a transverse field. Exploiting both thermal as well as virtual excitations of higher crystal-field states, we find that the spin chain is in the XY limit with an anisotropy J(z)/J(perpendicular to) approximate to 0.12, substantially smaller than previously believed. A spin-flop Ising quantum phase transition occurs at a critical field of mu H-0(b)cr approximate to 2 T before around 3.5 T the description in terms of an effective spin-1/2 chain becomes inapplicable.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Breunig, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sela, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buldmann, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohaty, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-473790
DOI:	10.1103/PhysRevLett.111.187202
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	111
Number:	18
Date:	2013
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language QUANTUM; MODEL; ORDER Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47379