2004/12/31 by V. P. Mineev, M. E. Zhitomirsky
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Nuclear Materials and Properties #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.72.014432
published as Phys. Rev. B 72, 014432 (2005) · 11 pages, 2 figures
openalex publication_date 2005/07/14 · arxiv created 2005/07/18 · arxiv updated 2009/12/01 · openalex created_date 2019/03/22 · openalex updated_date 2026/07/28
Theoretical model for magnetic ordering in the heavy-fermion metal URu2Si2 is suggested. The 17.5 K transition in this material is ascribed to formation of a spin-density wave (SDW), which develops due to a partial nesting between electron and hole parts of the Fermi surface and has a negligibly small form factor. Staggered field in the SDW state induces tiny antiferromagnetic order in the subsystem of localized singlet-singlet levels. Unlike the other models, our scenario is based on coexistence of two orderings with the same antiferromagnetic dipole symmetry. The topology of the pressure phase diagram for such a two-order parameter model is studied in the framework of the Landau theory. The field dependences of the staggered magnetization and the magnon gap are derived from the microscopic theory and found to be in good quantitative agreement with experiment.