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Number of results
2009 | 115 | 1 | 101-103
Article title

Ground States of the Spin-One-Half Falicov-Kimball Model with Hund's Rule Coupling in Two Dimensions

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EN
Abstracts
EN
The spin-one-half Falicov-Kimball model with spin-dependent on-site interaction between localized (f) and itinerant (d) electrons is studied by small-cluster exact-diagonalization calculations and a well-controlled approximative method in two dimensions. The results obtained are used to categorize the ground-state configurations according to common features (charge and spin ordering) for all f and d electron concentrations (n_f and n_d) on finite square lattices. It is shown that only a few configuration types form the basic structure of the charge phase diagram in the n_f-n_d plane. In particular, the largest regions of stability correspond to the phase segregated configurations and configurations that can be considered as mixtures of chessboard configurations and the full (empty) lattice. Since the magnetic phase diagram is much richer than the charge phase diagram, the magnetic superstructures are examined only at selected values of f and d electron concentrations.
Keywords
EN
Contributors
  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia
  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia
  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia
author
  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia
References
  • 1. C.H. Chen, S.W. Cheong, A.S. Cooper, Phys. Rev. Lett. 71, 2461 (1993)
  • 2. J.M. Tranquada, B.J. Sternlieb, J.D. Axe, Y. Nakamura, S. Uchida, Nature (London) 375, 561 (1995)
  • 3. K. Takada, H. Sakurai, E. Takayama-Muromachi, F. Izumi, Nature (London) 422, 53 (2003)
  • 4. R. Lemanski, Phys. Rev. B 71, 035107 (2005)
  • 5. P. Farkašovský, Eur. Phys. J. B 20, 209 (2001)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv115n1021kz
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