Universität zu Köln

Niermann, D., Grams, C. P., Becker, P., Bohaty, L., Schenck, H. and Hemberger, J. (2015). Critical Slowing Down near the Multiferroic Phase Transition in MnWO4. Phys. Rev. Lett., 114 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

Full text not available from this repository.

Abstract

By using broadband dielectric spectroscopy in the radio frequency and microwave range, we studied the magnetoelectric dynamics in the multiferroic chiral antiferromagnet MnWO4. Above the multiferroic phase transition at T-N2 approximate to 12.6 K we observe a critical slowing of the corresponding magnetoelectric fluctuations resembling the soft-mode behavior in canonical ferroelectrics. This electric-field-driven excitation carries much less spectral weight than ordinary phonon modes. Also, the critical slowing down of this mode scales with an exponent larger than 1, which is expected for magnetic second-order phase transition scenarios. Therefore, the investigated dynamics have to be interpreted as the softening of an electrically active magnetic excitation, an electromagnon.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Niermann, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grams, C. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohaty, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schenck, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hemberger, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-414373
DOI:	10.1103/PhysRevLett.114.037204
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	114
Number:	3
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 3-DIMENSIONAL ISING-MODEL; CRITICAL-DYNAMICS; MONTE-CARLO; EXPONENTS Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41437