Universität zu Köln

Buhrandt, Stefan and Fritz, Lars (2014). Spin-liquid phase and order by disorder of classical Heisenberg spins on the swedenborgite lattice. Phys. Rev. B, 90 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

Frustration refers to the inability to satisfy competing interactions simultaneously, often leading to a large number of degenerate ground states. This can suppress ordering tendencies, sometimes resulting in a spin-liquid phase. An intrinsic effect lifting this degeneracy is entropic order by disorder. We present strong evidence that a classical nearest-neighbor Heisenberg model on the swedenborgite lattice exhibits both an extended spin-liquid phase as well as entropic order-by-disorder choosing coplanar configurations after a first-order transition. We argue that this observation renders magnetic insulators such as RBaCo4O7, where R denotes a rare-earth atom, prime candidates for displaying spin-liquid behavior and entropic order-by-disorder physics due to their large exchange constant.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Buhrandt, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Fritz, Lars UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-433807
DOI:	10.1103/PhysRevB.90.020403
Journal or Publication Title:	Phys. Rev. B
Volume:	90
Number:	2
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1550-235X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language KAGOME ANTIFERROMAGNET; TEMPERATURE; TRANSITION; YBACO4O7; SYSTEM Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43380