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arXiv · 1105.2058

Multiferroic behavior in the new double-perovskite Lu$_2$MnCoO$_6$

S. Yanez-Vilar·E. D. Mun·V. S. Zapf·B. G. Ueland·J. Gardner·J. D. Thompson·J. Singleton·M. Sanchez-Andujar·J. Mira·N. Biskup·M. A. Senaris-Rodriguez·C. D. Batista
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Abstract

We present a new member of the multiferroic oxides, Lu$_2$MnCoO$_6$, which we have investigated using X-ray diffraction, neutron diffraction, specific heat, magnetization, electric polarization, and dielectric constant measurements. This material possesses an electric polarization strongly coupled to a net magnetization below 35 K, despite the antiferromagnetic ordering of the $S = 3/2$ Mn$^{4+}$ and Co$^{2+}$ spins in an $\uparrow \uparrow \downarrow \downarrow$ configuration along the c-direction. We discuss the magnetic order in terms of a condensation of domain boundaries between $\uparrow \uparrow$ and $\downarrow \downarrow$ ferromagnetic domains, with each domain boundary producing a net electric polarization due to spatial inversion symmetry breaking. In an applied magnetic field the domain boundaries slide, controlling the size of the net magnetization, electric polarization, and magnetoelectric coupling.

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S. Yanez-Vilar, E. D. Mun, V. S. Zapf, B. G. Ueland, J. Gardner, J. D. Thompson, J. Singleton, M. Sanchez-Andujar, J. Mira, N. Biskup, M. A. Senaris-Rodriguez, C. D. Batista. 2011-05-10. Multiferroic behavior in the new double-perovskite Lu$_2$MnCoO$_6$. https://doi.org/10.1103/physrevb.84.134427

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