Department of Physics Papers

Document Type

Journal Article

Date of this Version

8-19-2005

Publication Source

Physical Review Letters

Volume

95

Start Page

087205-1

Last Page

087205-4

DOI

10.1103/PhysRevLett.95.087205

Abstract

We show that long-range ferroelectric and incommensurate magnetic order appear simultaneously in a single phase transition in Ni3V2O8. The temperature and magnetic-field dependence of the spontaneous polarization show a strong coupling between magnetic and ferroelectric orders. We determine the magnetic symmetry using Landau theory for continuous phase transitions, which shows that the spin structure alone can break spatial inversion symmetry leading to ferroelectric order. This phenomenological theory explains our experimental observation that the spontaneous polarization is restricted to lie along the crystal b axis and predicts that the magnitude should be proportional to a magnetic order parameter.

Comments

At the time of publication, author Taner Yildirim was affiliated with the NIST Center for Neutron Research, Gaithersburg, Maryland. Currently, he is a faculty member in the Materials Science and Engineering Department at the University of Pennsylvania.

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Date Posted: 20 August 2015

This document has been peer reviewed.