Universität zu Köln

Kunkemoeller, S., Komleva, E., Streltsov, S. V., Hoffmann, S., Khomskii, D. I., Steffens, P., Sidis, Y., Schmalzl, K. and Braden, M. (2017). Magnon dispersion in Ca2Ru1-xTixO4: Impact of spin-orbit coupling and oxygen moments. Phys. Rev. B, 95 (21). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

Full text not available from this repository.

Abstract

The magnon dispersion of Ca2RuO4 has been studied by polarized and unpolarized neutron scattering experiments on crystals containing 0, 1, and 10% of Ti. Ti is inserted in order to enable the growth of large, partially detwinned crystals. One percent of Ti has a negligible impact on structural and magnetic properties. Also for 10% Ti content magnetic properties still change very little, but the insulating phase is stabilized up to at least 700 K and structural distortions are reduced. The full dispersion of transverse magnons studied for 1% Ti substitution can be well described by a conventional spin-wave model with interaction and anisotropy parameters that agree with density functional theory calculations. Spin-orbit coupling strongly influences the magnetic excitations, as it is most visible in large energies of the magnetic zone-center modes arising from magnetic anisotropy. Additional modes appear at low energy near the antiferromagnetic zone center and can be explained by a sizable magnetic moment of 0.11 Bohr magnetons, which the density functional theory calculations find located on the apical oxygens. The energy and the signal strength of the additional branch are well described by taking into account this oxygen moment with weak ferromagnetic coupling to the Ru moments.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kunkemoeller, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Komleva, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Streltsov, S. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoffmann, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Steffens, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sidis, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmalzl, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-227825
DOI:	10.1103/PhysRevB.95.214408
Journal or Publication Title:	Phys. Rev. B
Volume:	95
Number:	21
Date:	2017
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 ELECTRONIC-STRUCTURE; MAGNETIC-STRUCTURE; MOTT TRANSITION; SUPERCONDUCTIVITY; CA2RUO4; EXCITATIONS; OXIDES; METAL Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22782