Universität zu Köln

Kunkemoeller, S., Khomskii, D., Steffens, P., Piovano, A., Nugroho, A. A. and Braden, M. (2015). Highly Anisotropic Magnon Dispersion in Ca2RuO4: Evidence for Strong Spin Orbit Coupling. Phys. Rev. Lett., 115 (24). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

The magnon dispersion in Ca2RuO4 has been determined by inelastic neutron scattering on single crytals containing 1% of Ti. The dispersion is well described by a conventional Heisenberg model suggesting a local moment model with nearest neighbor interaction of J = 8 meV. Nearest and next-nearest neighbor interaction as well as interlayer coupling parameters are required to properly describe the entire dispersion. Spin-orbit coupling induces a very large anisotropy gap in the magnetic excitations in apparent contrast with a simple planar magnetic model. Orbital ordering breaking tetragonal symmetry, and strong spin-orbit coupling can thus be identified as important factors in this system.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kunkemoeller, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Steffens, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Piovano, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nugroho, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-383839
DOI:	10.1103/PhysRevLett.115.247201
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	115
Number:	24
Date:	2015
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 CRYSTAL Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38383