Universität zu Köln

Bruening, Daniel, Froehlich, Tobias, Langenbach, Malte, Leich, Thomas, Meven, Martin ORCID: 0000-0002-8079-5848, Becker, Petra, Bohaty, Ladislav, Grueninger, Markus, Braden, Markus and Lorenz, Thomas ORCID: 0000-0003-4832-5157 (2020). Magnetoelectric coupling in the mixed erythrosiderite [(NH4)(1-x)K-x](2)[FeCl5(H2O)]. Phys. Rev. B, 102 (5). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

Full text not available from this repository.

Abstract

We present a study of the dielectric, structural, and magnetic properties of the multiferroic or linear magnetoelectric substitution series [(NH4)(1-x)K-x](2) [FeCl5(H2O)]. Pyroelectric currents, magnetic susceptibilities, and thermodynamic properties were examined on large single crystals of the erythrosiderite compounds and detailed magnetic-field versus temperature phase diagrams are derived for three different substitution levels. With increasing potassium concentration the material is tuned from a multiferroic (x <= 0.06) to a linear magnetoelectric (x >= 0.15) ground state. In contrast to the respective pure parent compounds with x = 0 or 1, however, the ferroelectric or linear magnetoelectric polarization in none of the substituted samples is switchable by external electric fields because these samples exhibit a significant electric polarization already above the magnetic ordering transition. The polarization arises at a higher-lying structural phase transition that is examined by THz spectroscopy, and, on a deuterated pure single crystal, by comprehensive neutron-diffraction experiments. The structural phase transition is attributed to an ordering of NH4+ tetrahedra but does not break inversion symmetry in the pure material, while a finite K content causes pyroelectricity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bruening, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Froehlich, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Langenbach, Malte UNSPECIFIED UNSPECIFIED UNSPECIFIED Leich, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Meven, Martin UNSPECIFIED orcid.org/0000-0002-8079-5848 UNSPECIFIED Becker, Petra UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohaty, Ladislav UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-323697
DOI:	10.1103/PhysRevB.102.054413
Journal or Publication Title:	Phys. Rev. B
Volume:	102
Number:	5
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
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 Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32369