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: email@example.com
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.