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

• Authors: H. Čenčariková , P. Farkašovský , N. Tomašovičová , M. Žonda
• Languages of publication: 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

75.10.Lp; 71.27.+a; 71.28.+d

Discipline

• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 75.10.Lp: Band and itinerant models
• 71.28.+d: Narrow-band systems; intermediate-valence solids(for magnetic aspects, see 75.20.Hr and 75.30.Mb in magnetic properties and materials)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 1
• Pages: 101-103

Dates

published

2009-01

Contributors

author

H. Čenčariková

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia

author

P. Farkašovský

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia

author

N. Tomašovičová

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia

author

M. Žonda

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01 Košice, Slovakia

References

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• 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)

Identifiers

DOI

10.12693/APhysPolA.115.101