Robust Ferroelectric State in Multiferroic Mn$_{1-x}$Zn$_x$WO$_4$

Details Robust Ferroelectric State in Multiferroic Mn$_{1-x}$Zn$_x$WO$_4$ Robust Ferroelectric State in Multiferroic Mn$_{1-x}$Zn$_x$WO$_4$

2010-11-30

arxiv.org/abs/1011.6645v2

Phys. Rev. B 83, 014401 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 8 figures

Scientific paper

10.1103/PhysRevB.83.014401

We report the remarkably robust ferroelectric state in the multiferroic compound Mn$_{1-x}$Zn$_x$WO$_4$. The substitution of the magnetic Mn$^{2+}$ with nonmagnetic Zn$^{2+}$ reduces the magnetic exchange and provides control of the various magnetic and multiferroic states of MnWO$_4$. Only 5 % of Zn substitution results in a complete suppression of the frustrated collinear (paraelectric) low temperature phase. The helical magnetic and ferroelectric phase develops as the ground state. The multiferroic state is stable up to a high level of substitution of more than 50 %. The magnetic, thermodynamic, and dielectric properties as well as the ferroelectric polarization of single crystals of Mn$_{1-x}$Zn$_x$WO$_4$ are studied for different substitutions up to x=0.5. The magnetic phases have been identified in single crystal neutron scattering experiments. The ferroelectric polarization scales with the neutron intensity of the incommensurate peak of the helical phase.

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