Universität zu Köln

Versteeg, R. B., Vergara, I., Schaefer, S. D., Bischoff, D., Aqeel, A., Palstra, T. T. M., Grueninger, M. and van Loosdrecht, P. H. M. (2016). Optically probed symmetry breaking in the chiral magnet Cu2OSeO3. Phys. Rev. B, 94 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report on the linear optical properties of the chiral magnet Cu2OSeO3, specifically associated with the absence of inversion symmetry, the chiral crystallographic structure, and magnetic order. Through spectroscopic ellipsometry, we observe local crystal-field excitations below the charge-transfer gap. These crystal-field excitations are optically allowed due to the lack of inversion symmetry at the Cu sites. Optical polarization rotation measurements were used to study the structural chirality and magnetic order. The temperature dependence of the natural optical rotation, originating in the chiral crystal structure, provides evidence for a finite magnetoelectric effect in the helimagnetic phase. We find a large magneto-optical susceptibility on the order of V(540 nm) similar to 10(4) rad/Tm in the helimagnetic phase and a maximum Faraday rotation of similar to 170 deg/mm in the ferrimagnetic phase. The large value of V can be explained by considering spin cluster formation and the relative ease of domain reorientation in this metamagnetic material. The magneto-optical activity allows us to map the magnetic phase diagram, including the skyrmion lattice phase. In addition to this, we probe and discuss the nature of the various magnetic phase transitions in Cu2OSeO3.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Versteeg, R. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vergara, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaefer, S. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bischoff, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aqeel, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palstra, T. T. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED van Loosdrecht, P. H. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-262489
DOI:	10.1103/PhysRevB.94.094409
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	9
Date:	2016
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 CIRCULAR BIREFRINGENCE; FARADAY-ROTATION; EXCITATIONS; SKYRMIONS; SPECTRUM Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26248