2008/05/23 by Takayoshi Tanaka, Sumio Ishihara
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Algorithm #Condensed matter physics #Degenerate energy levels #Diagonal #Geometry #Ising model #Magnetic and transport properties of perovskites and related materials #Mathematics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.153106
5 pages, 3 figures
arxiv created 2008/05/23 · openalex publication_date 2008/10/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Finite-temperature orbital state in a ferromagnetic Mott insulator with triply degenerate t2g orbital is investigated numerically. We employ the quantum Monte Carlo simulation with the loop algorithm. Indications for conventional staggered-type orbital order are not remarkable down to the lowest temperature to which the present simulation can get access. Physical parameters monitoring the off-diagonal orbital order, which is characterized by a linear combination of the (dyz,dzx,dxy) orbital-wave functions with equal weights, are not conspicuous. It is found that an orbital gaplike behavior appears in the uniform orbital susceptibility. This is supported by a threshold behavior in the staggered correlation function in a calculation with the additional Ising-type interaction. Some rigorous remarks for the long-range orbital order are also presented.