Pressure-Temperature Phase Diagram of Multiferroic $Ni_3V_2O_8$

Details Pressure-Temperature Phase Diagram of Multiferroic $Ni_3V_2O_8$ Pressure-Temperature Phase Diagram of Multiferroic $Ni_3V_2O_8$

2007-01-23

arxiv.org/abs/cond-mat/0701576v1

Phys. Rev. B 75, 012407 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.75.012407

The pressure-temperature phase diagram of multiferroic $Ni_3V_2O_8$ is investigated for hydrostatic pressures up to 2 GPa. 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 1.64 GPa at 6.2 K. Thermal expansion measurements at ambient pressure show strong step-like 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.

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