Orbital-based Scenario for Magnetic Structure of Neptunium Compounds

Abstract

In order to understand a crucial role of orbital degree of freedom in the magnetic structure of recently synthesized neptunium compounds NpTGa_5 (T=Fe, Co, and Ni), we propose to discuss the magnetic phase of an effective two-orbital model, which has been constructed based on a j-j coupling scheme to explain the magnetic structure of uranium compounds UTGa_5. By analyzing the model with the use of numerical technique such as exact diagonalization, we obtain the phase diagram including several kinds of magnetic states. An orbital-based scenario is discussed to understand the change in the magnetic structure among C-, A-, and G-type antiferromagnetic phases, experimentally observed in NpFeGa_5, NpCoGa_5, and NpNiGa_5.

arXiv comment18 pages, 8 figures, to appear in New Journal of Physics

References in corpus (25)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Distorted Perovskite with e_g^1 Configuration as a Frustrated Spin System
• Charge ordered ferromagnetic phase in La0.5Ca0.5MnO3
• Electronic origin of magnetic and orbital ordering in insulating LaMnO_3
• Ferromagnetic, A-type, and Charge-Ordered CE-type States in Doped Manganites using Jahn-Teller Phonons
• From Mott insulator to ferromagnetic metal: a pressure study of Ca${}_2$RuO${}_4$
• Orbital dynamics in ferromagnetic transition metal oxides
• Electronic Structure and Fermiology of PuCoGa${}_5$
• Unveiling New Magnetic Phases of Undoped and Doped Manganites
• Construction of microscopic model for f-electron systems on the basis of j-j coupling scheme
• Prediction of Orbital Ordering in Single-Layered Ruthenates
• Topological Scenario for Stripe Formation in Manganese Oxides
• Optical conductivity of colossal magnetorestistance compounds: Role of orbital degeneracy in the ferromagnetic phase
• Stripes Induced by Orbital Ordering in Layered Manganites
• A-type Antiferromagnetic and C-type Orbital-Ordered State in LaMnO${}_3$ Using Cooperative Jahn-Teller Phonons
• The dual nature of 5f electrons and origin of heavy fermions in U compounds
• Joint superexchange--Jahn-Teller mechanism for A-type antiferromagnetism in $LaMn{O}_3$
• Study of low-energy magnetic excitations in single-crystalline CeIn3 by inelastic neutron scattering
• Orbital Ordering, New Phases, and Stripe Formation in Doped Layered Nickelates
• The Anti-Jahn-Teller Polaron in LaMnO${}_3$
• Jahn-Teller distortion and electronic correlation effects in undoped manganese perovskites
• Orbital-based Scenario for Magnetic Structure of Neptunium Compounds
• Stabilization of A-type layered antiferromagnetic phase in LaMnO_3 by cooperative Jahn-Teller deformations
• Spin and orbital structure of uranium compounds on the basis of a j-j coupling scheme
• Approximative treatment of 5f-systems with partial localization due to intra-atomic correlations

Cited by in corpus (8)

• Orbital ordering phenomena in $d$- and $f$-electron systems
• Effective Crystalline Electric Field Potential in a j-j Coupling Scheme
• Double-Exchange Ferromagnetism and Orbital-Fluctuation-Induced Superconductivity in Cubic Uranium Compounds
• Orbital-based Scenario for Magnetic Structure of Neptunium Compounds
• Microscopic Approach to Magnetism and Superconductivity of $f$-Electron Systems with Filled Skutterudite Structure
• Resonant x-ray scattering study of NpRhGa_5 and NpCoGa_5
• Multipole Susceptibility of Multiorbital Anderson Model Coupled with Jahn-Teller Phonons
• Multipole correlations in low-dimensional f-electron systems