Universität zu Köln

Holbein, S., Ackermann, M., Chapon, L., Steffens, P., Gukasov, A., Sazonov, A., Breunig, O., Sanders, Y., Becker, P., Bohaty, L., Lorenz, T. and Braden, M. (2016). Strong magnetoelastic coupling at the transition from harmonic to anharmonic order in NaFe(WO4)(2) with 3d(5) configuration. Phys. Rev. B, 94 (10). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The crystal structure of the double tungstate NaFe(WO4)(2) arises from that of the spin-driven multiferroic MnWO4 by inserting nonmagnetic Na layers. NaFe(WO4)(2) exhibits a three-dimensional incommensurate spin-spiral structure at low temperature and zero magnetic field, which, however, competes with commensurate order induced by magnetic field. The incommensurate zero-field phase corresponds to the condensation of a single irreducible representation but it does not imply ferroelectric polarization because spirals with opposite chirality coexist. Sizable anharmonic modulations emerge in this incommensurate structure, which are accompanied by large magnetoelastic anomalies, while the onset of the harmonic order is invisible in the thermal-expansion coefficient. In magnetic fields applied along the monoclinic axis, we observe a first-order transition to a commensurate structure that again is accompanied by large magnetoelastic effects. The large magnetoelastic coupling, a reduction of the b lattice parameter, is thus associated only with the commensurate order. Upon releasing the field at low temperature, the magnetic order transforms to another commensurate structure that considerably differs from the incommensurate low-temperature phase emerging upon zero-field cooling. The latter phase, which exhibits a reduced ordered moment, seems to be metastable.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Holbein, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ackermann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chapon, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Steffens, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gukasov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sazonov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Breunig, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanders, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohaty, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-262151
DOI:	10.1103/PhysRevB.94.104423
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	10
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 PHASE-TRANSITIONS; THERMAL-EXPANSION; CRYSTAL-STRUCTURE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26215