Pressure-temperature phase diagram of multiferroic Ni3V2O8
Abstract
The pressure-temperature phase diagram of multiferroic Ni3V2O8 is investigated for hydrostatic pressures up to 2GPa . The stability range of the ferroelectric phase associated with the incommensurate helical spin order is reduced by pressure and ferroelectricity is completely suppressed at the critical pressure of 1.64GPa at 6.2K . Thermal expansion measurements at ambient pressure show strong steplike anomalies of the lattice parameters associated with the lock-in transition into the commensurate paraelectric phase. The expansion anomalies are highly anisotropic; the related volume change is consistent with the high-pressure phase diagram.
- Publication:
-
Physical Review B
- Pub Date:
- January 2007
- DOI:
- 10.1103/PhysRevB.75.012407
- arXiv:
- arXiv:cond-mat/0701576
- Bibcode:
- 2007PhRvB..75a2407C
- Keywords:
-
- 75.30.-m;
- 75.30.Kz;
- 75.50.Ee;
- 77.80.-e;
- Intrinsic properties of magnetically ordered materials;
- Magnetic phase boundaries;
- Antiferromagnetics;
- Ferroelectricity and antiferroelectricity;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Materials Science
- E-Print:
- Phys. Rev. B 75, 012407 (2007)