Universität zu Köln

Bauer, A., Chacon, A., Wagner, M., Halder, M., Georgii, R., Rosch, A., Pfleiderer, C. and Garst, M. (2017). Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi. Phys. Rev. B, 95 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report a study of the reorientation of the helimagnetic order in the archetypal cubic chiral magnet MnSi as a function of magnetic field direction. The reorientation process as inferred from small-angle neutron scattering, the magnetization, and the ac susceptibility is in excellent agreement with an effective mean-field theory taking into account the precise symmetries of the crystallographic space group. Depending on the field and temperature history and the direction of the field with respect to the crystalline axes, the helix reorientation may exhibit a crossover, a first-order, or a second-order transition. The magnetization and ac susceptibility provide evidence that the reorientation of helimagnetic domains is associated with large relaxation times exceeding seconds. At the second-order transitions residual Ising symmetries are spontaneously broken at continuous elastic instabilities of the helimagnetic order. In addition, on the time scales explored in our experiments these transitions are hysteretic as a function of field suggesting, within the same theoretical framework, the formation of an abundance of plastic deformations of the helical spin order. These deformations comprise topologically nontrivial disclinations, reminiscent of the skyrmions discovered recently in the same class of materials.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bauer, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chacon, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagner, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Halder, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Georgii, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pfleiderer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-242238
DOI:	10.1103/PhysRevB.95.024429
Journal or Publication Title:	Phys. Rev. B
Volume:	95
Number:	2
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 NON-FERMI-LIQUID; REAL-SPACE OBSERVATION; SPIN-DENSITY WAVE; SKYRMION-LATTICE; MAGNETIC-STRUCTURES; PHASE-TRANSITIONS; FEGE; FLUCTUATIONS; TEMPERATURE; METALS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24223