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.
Keywords
Cite
@article{arxiv.cond-mat/0411100,
title = {Orbital-based Scenario for Magnetic Structure of Neptunium Compounds},
author = {Hiroaki Onishi and Takashi Hotta},
journal= {arXiv preprint arXiv:cond-mat/0411100},
year = {2009}
}
Comments
18 pages, 8 figures, to appear in New Journal of Physics