Volume 85, Number 3, February 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 February 2009|
Magnetic order beyond RKKY in the classical Kondo lattice
Harish-Chandra Research Institute - Chhatnag Road, Jhusi, Allahabad 211019, India
Corresponding author: firstname.lastname@example.org
Accepted: 20 January 2009
We study the Kondo lattice model of band electrons coupled to classical spins, in three dimensions, using a combination of variational calculation and Monte Carlo. We use the weak-coupling “RKKY” window and the strong-coupling regime as benchmarks, but focus on the physically relevant intermediate-coupling regime. Even for modest electron-spin coupling the phase boundaries move away from the RKKY results, the non-interacting Fermi surface no longer dictates magnetic order, and weak-coupling “spiral” phases give way to collinear order. We use these results to revisit the classic problem of magnetism and demonstrate how both electronic structure and coupling effects beyond RKKY control the magnetism in these materials.
PACS: 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 75.30.Et – Exchange and superexchange interactions / 71.20.Eh – Rare earth metals and alloys
© EPLA, 2009
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