1998/12/31 by Pascal Roos, Seiji Miyashita
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Condensed matter physics #Ground state #Impurity #Magnetic field #Magnetization #Mathematics #Monte Carlo method #Physics #Physics of Superconductivity and Magnetism #Population #Quantum mechanics #Spin (aerodynamics) #Statistics #Theoretical and Computational Physics #Thermodynamics #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.59.13782
13 pages, 16 figures. Corrected version due to inverted picture 3a and 3b. RevTex. Submitted to Phys. Rev. B
arxiv created 1999/01/19 · openalex publication_date 1999/06/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the temperature dependence of low-temperature spin configurations, investigating the magnetization profile of the local states due to the impurities and the two point correlation function centered on one of the impurities. This correlation is found to be weak against increases in temperature, although the magnetization profile in the triplet state is visible up to higher temperatures. Here we introduce a loop cluster quantum Monte Carlo method with a fixed magnetization Mz in order to study the correlations in the ground state with a given value of Mz. From the population distribution of magnetization, a very small energy gap between the quasidegenerate states due to the impurities is obtained.