Kugler, M., Brandl, G., Waizner, J., Janoschek, M., Georgii, R., Bauer, A., Seemann, K., Rosch, A., Pfleiderer, C., Boeni, P. and Garst, M. (2015). Band Structure of Helimagnons in MnSi Resolved by Inelastic Neutron Scattering. Phys. Rev. Lett., 115 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

A magnetic helix realizes a one-dimensional magnetic crystal with a period given by the pitch length lambda(h). Its spin-wave excitations-the helimagnons-experience Bragg scattering off this periodicity, leading to gaps in the spectrum that inhibit their propagation along the pitch direction. Using high-resolution inelastic neutron scattering, the resulting band structure of helimagnons was resolved by preparing a single crystal of MnSi in a single magnetic-helix domain. At least five helimagnon bands could be identified that cover the crossover from flat bands at low energies with helimagnons basically localized along the pitch direction to dispersing bands at higher energies. In the low-energy limit, we find the helimagnon spectrum to be determined by a universal, parameter-free theory. Taking into account corrections to this low-energy theory, quantitative agreement is obtained in the entire energy range studied with the help of a single fitting parameter.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Kugler, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brandl, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waizner, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Janoschek, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Georgii, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bauer, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seemann, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rosch, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pfleiderer, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boeni, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garst, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-396144
DOI: 10.1103/PhysRevLett.115.097203
Journal or Publication Title: Phys. Rev. Lett.
Volume: 115
Number: 9
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:
KeywordsLanguage
NON-FERMI-LIQUID; CHIRAL MAGNET; SKYRMIONSMultiple languages
Physics, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/39614

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