Universität zu Köln

Grams, Christoph P., Kopatz, Severin, Bruening, Daniel, Biesenkamp, Sebastian, Becker, Petra, Bohaty, Ladislav, Lorenz, Thomas ORCID: 0000-0003-4832-5157 and Hemberger, Joachim (2019). Evidence for polarized nanoregions from the domain dynamics in multiferroic LiCuVO4. Sci Rep, 9. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

LiCuVO4 is a model system of a 1D spin-1/2 chain that enters a planar spin-spiral ground state below its Neel temperature of 2.4 K due to competing nearest and next nearest neighbor interactions. The spin-spiral state is multiferroic with an electric polarization along the a axis which has been proposed to be caused purely by the spin supercurrent mechanism. With external magnetic fields in c direction T-N can be suppressed down to 0 K at 7.4T. Here we report dynamical measurements of the polarization from P(E)-hysteresis loops, magnetic field dependent pyro-current and non-linear dielectric spectroscopy as well as thermal expansion and magnetostriction measurements at very low temperatures. The multiferroic transition is accompanied by strong anomalies in the thermal expansion and magnetostriction coefficients and we find slow switching times of electric domain reversal. Both observations suggest a sizable magnetoelastic coupling in LiCuVO4. By analyzing the non-linear polarization dynamics we derive domain sizes in the nm range that are probably caused by Li defects.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Grams, Christoph P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kopatz, Severin UNSPECIFIED UNSPECIFIED UNSPECIFIED Bruening, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Biesenkamp, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Petra UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohaty, Ladislav UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED Hemberger, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-153864
DOI:	10.1038/s41598-019-40839-5
Journal or Publication Title:	Sci Rep
Volume:	9
Date:	2019
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CRYSTAL-GROWTH; PHASE; STOICHIOMETRY; TEMPERATURE Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15386