Universität zu Köln

Buhrandt, Stefan and Fritz, Lars (2014). Antiferromagnetic Ising model on the swedenborgite lattice. Phys. Rev. B, 90 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Geometrical frustration in spin systems often results in a large number of degenerate ground states. In this work, we study the antiferromagnetic Ising model on the three-dimensional swedenborgite lattice, which is a specific stacking of kagome and triangular layers. The model contains two exchange couplings, one within the kagome layer and another in between the kagome and triangular layers. We determine the phase diagram with and without an easy-axis magnetic field, and we calculate the ground-state degeneracy explicitly in terms of the residual entropy. At zero field, we find two different ground-state manifolds separated by a first-order transition at T = 0 and equal exchange couplings. We also determine the T = 0 phase diagram in a magnetic field and find a rich phase diagram with both degenerate and nondegenerate phases depending on the field strength and out-of-plane coupling.

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:38-428532
DOI:	10.1103/PhysRevB.90.094415
Journal or Publication Title:	Phys. Rev. B
Volume:	90
Number:	9
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language YBACO4O7; KAGOME Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42853