TY - JOUR
T1 - Theory of half-metallic ferrimagnetism in double perovskites
AU - Erten, Onur
AU - Meetei, O. Nganba
AU - Mukherjee, Anamitra
AU - Randeria, Mohit
AU - Trivedi, Nandini
AU - Woodward, Patrick
PY - 2011/12/13
Y1 - 2011/12/13
N2 - Double perovskites such as Sr 2FeMoO 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.
AB - Double perovskites such as Sr 2FeMoO 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.
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U2 - 10.1103/PhysRevLett.107.257201
DO - 10.1103/PhysRevLett.107.257201
M3 - Article
C2 - 22243105
AN - SCOPUS:83655164997
SN - 0031-9007
VL - 107
JO - Physical Review Letters
JF - Physical Review Letters
IS - 25
M1 - 257201
ER -