Abstract
We report magnetic, dielectric, and magnetodielectric responses of the pure monoclinic bulk phase of partially disordered , exhibiting a spectrum of unusual properties and establish that this compound is an intrinsically multiglass system with a large magnetodielectric coupling (8%–20%) over a wide range of temperatures (150–300 K). Specifically, our results establish a unique way to obtain colossal magnetodielectricity, independent of any striction effects, by engineering the asymmetric hopping contribution to the dielectric constant via the tuning of the relative-spin orientations between neighboring magnetic ions in a transition-metal oxide system. We discuss the role of antisite (Ni-Mn) disorder in emergence of these unusual properties.
- Received 7 April 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.127201
© 2012 American Physical Society
Viewpoint
Charge Hopping in Glassy Magnets
Published 19 March 2012
In some transition metal oxides, disorder makes the dielectric constant highly sensitive to an applied magnetic field over a broad range of temperatures.
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