title: Theory of half-metallic ferrimagnetism in double perovskites.
abstract: Double perovskites such as Sr(2)FeMoO(6) are rare examples of materials with half-metallic ground states and a ferrimagnetic T(c) above room temperature. We present a comprehensive theory of the temperature and disorder dependence of their magnetic properties by deriving and validating a new effective spin Hamiltonian for these materials, amenable to large-scale three-dimensional simulations. We show how disorder, ubiquitous in these materials, affects T(c), the magnetization, and the conduction electron polarization. We conclude with a novel proposal to enhance T(c) without sacrificing polarization.
authors.affiliation: Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: Onur
authors.initials: O
authors.lastname: Erten
authors.forename: O Nganba
authors.initials: ON
authors.lastname: Meetei
authors.forename: Anamitra
authors.initials: A
authors.lastname: Mukherjee
authors.forename: Mohit
authors.initials: M
authors.lastname: Randeria
authors.forename: Nandini
authors.initials: N
authors.lastname: Trivedi
authors.forename: Patrick
authors.initials: P
authors.lastname: Woodward