Giant Magneto-electric Effect in the Novel Mott Insulator, Sr2IrO4
S. Chikara, O. Korneta, W. P. Crummett, L.E. DeLong, P. Schlottmann, and G. Cao
TL;DR
This paper reports a giant magneto-electric effect in Sr2IrO4, a novel Mott insulator, driven by spin-orbit coupling, with significant changes in electric permittivity and polarization linked to magnetic transitions.
Contribution
It uncovers a new mechanism for magneto-electric coupling in Sr2IrO4 based on spin-orbit gapping, differing from traditional magnetization-dependent effects.
Findings
Enhanced electric permittivity peaks near 100 K magnetic anomaly
Large magneto-dielectric shift (~100%) near metamagnetic transition
Magnetic and electric polarization hysteresis observed
Abstract
Our magnetic, electrical, and thermal measurements on single-crystals of the novel Mott insulator, Sr2IrO4, reveal a novel giant magneto-electric effect (GME) arising from a frustrated magnetic/ferroelectric state whose signatures are: (1) a strongly enhanced electric permittivity that peaks near a newly observed magnetic anomaly at 100 K, (2) a large (~100%) magneto-dielectric shift that occurs near a metamagnetic transition, and (3) magnetic and electric polarization hysteresis. The GME and electric polarization hinge on a spin-orbit gapping of 5d-bands, rather than the magnitude and spatial dependence of magnetization, as traditionally accepted.
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