Field-dependent competing magnetic ordering in multiferroic Ni3V2O8A. 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
received 22 January 2009; accepted in final form 7 May 2009; published June 2009
published online 8 June 2009
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.
75.80.+q - Magnetomechanical and magnetoelectric effects, magnetostriction.
75.10.-b - General theory and models of magnetic ordering.
© EPLA 2009