Anisotropy study of multiferroicity in the pyroxene NaFeGe2O6. (20th January 2015)

• Record Type: Journal Article
• Authors: Ackermann, M; Andersen, L; Lorenz, T; Bohatý, L; Becker, P
• Is Part Of: New journal of physics. Volume 17:Number 1(2015:Jan.)
• Publication Date: 2015-01-20
• Subjects: multiferroic -- pyroxene -- magnetoelectric; 75.85.+t -- 77.80.-e -- 75.30.Cr -- 77.70.+a; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/17/1/013045
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We present a study of the anisotropy of the dielectric, magnetic and magnetoelastic properties of the multiferroic clinopyroxene NaFeGe2 O6 . Pyroelectric currents, dielectric constants and magnetic susceptibilities as well as the thermal expansion and the magnetostriction were examined on large synthetic single crystals of NaFeGe2 O6 . The spontaneous electric polarization detected below in an antiferromagnetically ordered state ( ) is mainly lying within the ac plane with a small component along, indicating a triclinic symmetry of the multiferroic phase of NaFeGe2 O6 . The electric polarization can be strongly modified by applying magnetic fields along different directions. We derive detailed magnetic field versus temperature phase diagrams and identify three multiferroic low-temperature phases, which are separated by a non-ferroelectric, antiferromagnetically ordered state from the paramagnetic high-temperature phase.