title: Near-room-temperature colossal magnetodielectricity and multiglass properties in partially disordered La2NiMnO6.
abstract: We report magnetic, dielectric, and magnetodielectric responses of the pure monoclinic bulk phase of partially disordered La2NiMnO6, 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.
authors.affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore-560012, India.
authors.forename: D
authors.initials: D
authors.lastname: Choudhury
authors.forename: P
authors.initials: P
authors.lastname: Mandal
authors.forename: R
authors.initials: R
authors.lastname: Mathieu
authors.forename: A
authors.initials: A
authors.lastname: Hazarika
authors.forename: S
authors.initials: S
authors.lastname: Rajan
authors.forename: A
authors.initials: A
authors.lastname: Sundaresan
authors.forename: U V
authors.initials: UV
authors.lastname: Waghmare
authors.forename: R
authors.initials: R
authors.lastname: Knut
authors.forename: O
authors.initials: O
authors.lastname: Karis
authors.forename: P
authors.initials: P
authors.lastname: Nordblad
authors.forename: D D
authors.initials: DD
authors.lastname: Sarma