Interplay between SDW and induced local moments in URu2Si2

Abstract

Theoretical model for magnetic ordering in the heavy-fermion metal URu2Si2 is suggested. The 17.5K transition in this material is ascribed to formation of a spin-density wave, 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.

11 pages, 2 figures

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• Competing Ordered Phases in URu2Si2: Hydrostatic Pressure and Re-substitution
• Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2
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• Electrical Resistivity and Thermal Expansion Measurements of URu2Si2 under Pressure
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• Pressure dependence of the magnetization of URu2Si2
• Neutron scattering studies on URu2Si2
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• Hidden order pseudogap in URu${}_2$Si${}_2$
• Irreversible dynamics of the phase boundary in U(Ru0.9)Rh0.04)2Si2 and implications for ordering
• Skutterudite Results Shed Light on Heavy Fermion Physics
• Hybridization gap versus hidden order gap in URu${}_2$Si${}_2$ as revealed by optical spectroscopy
• Multipole order and global/site symmetry in the hidden order phase of URu2Si2
• Nuclear magnetic resonance studies of pseudospin fluctuations in URu${}_2$Si${}_2$
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• 3D Modulated Spin Liquid model applied to URu${}_2$Si${}_2$
• Local suppression of the hidden order phase by impurities in URu2Si2
• Quadrupole partial orders and triple-$q$ states on the face-centered cubic lattice
• Thermodynamic evidence for broken fourfold rotational symmetry in the hidden-order phase of URu2Si2
• Hydrostaticity and hidden order: effects of experimental conditions on the temperature-pressure phase diagram of URu2Si2
• Inelastic x-ray scattering measurements on URu2Si2
• Modulated Spin Liquid and Magnetic Order from a Kondo-Heisenberg model applied to $UR{u}_{2}S{i}_2$
• Bi- and tetracritical phase diagrams in three dimensions
• Gaussian fluctuation corrections to a mean-field theory of complex hidden order in URu${}_2$Si${}_2$
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• Unfolding of antiferromagnetic phases and multicritical points in a two-orbital model for Uranium compounds under pressure and magnetic field
• Finite temperature effects in quantum systems with competing scalar orders
• One-loop effective potential for two-dimensional competing scalar order parameters
• Multipolar multiferroics in $4d^2$/$5d^2$ Mott insulators
• Quantum corrections for the phase diagram of systems with competing order
• Phenomenological theory of the superconducting state inside the hidden-order phase of URu${}_2$Si${}_2$
• Spin-orbit density wave: A new phase of matter applicable to the hidden order state of URu2Si2
• The hidden order in URu2Si2: Symmetry-induced anti-toroidal vortices
• Uncovering the hidden order in URu2Si2: Identification of Fermi surface instability and gapping