Magnetic field-temperature phase diagrams of multiferroic (Ni0.9Co0.1)(3)V2O8

Abstract : We present macroscopic and neutron diffraction data on multiferroic lightly Co doped Ni3V2O8. The magnetic H-T phase diagrams have been derived from magnetization and electric polarization measurements with field directions parallel to the principal crystallographic axes. While the phase diagram for H parallel to b is very similar to that of the parent compound Ni3V2O8 for the commonly involved phases, the zero-field phases in (Ni0.9Co0.1)(3)V2O8 show a stronger instability for applied magnetic fields along the a or c axis. Neutron single-crystal diffraction revealed the magnetic structure of the field-induced phase for H parallel to c with a collinear spin alignment along the a and b axes for the two magnetically inequivalent sites. A pronounced irreversibility has been observed for the transition between the zero-field spin cycloid and the field-induced phase, which is manifested in a propagation vector change from q = (0.322 0 0) to q = (0.306 0 0), with slight modifications of the magnetic structure after reentering the zero-field phase. The reentrant phase is characterized by a significantly larger b component of the cross-tie site spin, therefore showing remanent features of the high-field phase. For H parallel to a the magnetization data reveal anomalies, one of which was proved to reflect a field-induced transition from the cycloidally to the sinusoidally modulated magnetic structure.
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Submitted on : Monday, July 30, 2018 - 2:31:48 PM
Last modification on : Thursday, April 4, 2019 - 5:08:04 PM

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Navid Qureshi, Eric Ressouche, A. A. Mukhin, V. Yu Ivanov, S. N. Barilo, et al.. Magnetic field-temperature phase diagrams of multiferroic (Ni0.9Co0.1)(3)V2O8. Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 94 (17), pp.174441. ⟨10.1103/PhysRevB.94.174441⟩. ⟨cea-01851573⟩

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