Issue
EPL
Volume 86, Number 5, June 2009
Article Number 57001
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/86/57001
Published online 08 June 2009
EPL, 86 (2009) 57001
DOI: 10.1209/0295-5075/86/57001

Field-dependent competing magnetic ordering in multiferroic Ni3V2O8

A. K. Singh1, D. Jain2, V. Ganesan2, A. K. Nigam3 and S. Patnaik1

1   School of Physical Sciences, Jawaharlal Nehru University - New Delhi 110067, India
2   UGC-DAE Consortium for Scientific Research, University Campus - Khandwa Road, Indore 452017, India
3   Tata Institute of Fundamental Research - Bombay 400 005, India

spatnaik@mail.jnu.ac.in

received 22 January 2009; accepted in final form 7 May 2009; published June 2009
published online 8 June 2009

Abstract
The geometrically frustrated magnet Ni3V2O8 undergoes a series of competing magnetic ordering at low temperatures. Most importantly, one of the incommensurate phases has been reported to develop a ferroelectric correlation caused by spin frustration. Here we report an extensive thermodynamic, dielectric and magnetic study on clean polycrystalline samples of this novel multiferroic compound. Our low-temperature specific heat data at high fields up to 14 Tesla clearly identify the development of a new magnetic-field–induced phase transition below 2 K that shows signatures of simultaneous electric ordering. We also report temperature- and field-dependent dielectric constant that enables us to quantitatively estimate the strength of magneto-electric coupling in this improper ferroelectric material.

PACS
75.80.+q - Magnetomechanical and magnetoelectric effects, magnetostriction.
75.10.-b - General theory and models of magnetic ordering.

© EPLA 2009