Charge Ordering and Phase Separations in the Molecular Crystal Model

• Authors: W. Czart , P. Grzybowski , S. Robaszkiewicz
• Languages of publication: EN

Abstracts

EN

We analyse the ground state phase diagrams and thermodynamic properties of charge orderings in narrow band materials using the molecular crystal model in the static limit. We present results for the hypercubic lattices in dimensions d = 2 and d = ∞. We focus our study on the problem of phase separations involving charge orderings and the effects of next-nearest-neighbor hopping (t_2) on the charge ordered states in these systems. The ground state phase diagrams are evaluated for a few representative cases. Results for the molecular crystal model are compared with those obtained previously for the spinless fermion model with repulsive intersite interaction W.

Keywords

EN

71.10.Fd; 71.30.+h; 71.45.Lr; 64.75.Gh

Discipline

• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 71.45.Lr: Charge-density-wave systems(see also 75.30.Fv Spin-density waves)
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)
• 64.75.Gh: Phase separation and segregation in model systems (hard spheres, Lennard-Jones, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 2
• Pages: 369-372

Dates

published

2010-08

Contributors

author

W. Czart

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

P. Grzybowski

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

S. Robaszkiewicz

• Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

References

• 1. M. Imada, A. Fujimori, Y. Tokura, Rev. Mod. Phys. 70, 1039 (1998)
• 2. T. Kimura, R. Kumai, Y. Tokura, J.Q. Li, Y. Matsui, Phys. Rev. B 58, 11081 (1998); E. Dagotto, T. Hotta, A. Moreo, Phys. Rep. 344, 1 (2001)
• 3. T. Goto, B. Lüthi, Adv. Phys. 52, 67 (2003)
• 4. M.Yu. Kagan, K.I. Kugel, Phys. Usp. 44, 553 (2001); M.Yu. Kagan, K.I. Kugel, D.I. Khomskii, J. Exp. Theor. Phys. 93, 415 (2001)
• 5. R. Micnas, J. Ranninger, S. Robaszkiewicz, Rev. Mod. Phys. 62, 113 (1990)
• 6. S. Robaszkiewicz, G. Pawłowski, Acta Phys. Pol. A 90, 569 (1996)
• 7. P. Fulde, P. Thalmeir, G. Zwicknagel, Solid State Phys. 60, 1 (2006)
• 8. Y.Z. Zhang, M.T. Tran, V. Yushankhai, P. Thalmeier, Eur. Phys. J. B 44, 265 (2005); A.T. Hoang, P. Thalmeier, J. Phys., Condens. Matter 14, 6639 (2002)
• 9. K. Rościszewski, A.M. Oleś, J. Phys., Condens. Matter 15, 8363 (2003)
• 10. N.H. Tong, S.-Q. Shen, R. Bulla, Phys. Rev. B 70, 085118 (2004)
• 11. G.S. Uhrig, R. Vlaming, Phys. Rev. Lett. 71, 271 (1993)
• 12. W. Czart, S. Robaszkiewicz, B. Tobijaszewska, Acta Phys. Pol. A 114, 73 (2008)
• 13. H. Seo, J. Merino, H. Yoshioka, M. Ogata, J. Phys. Soc. Jpn. 75, 51009 (2006)
• 14. S. Robaszkiewicz, T. Kostyrko, Physica B 112, 389 (1982); 121, 134 (1983)
• 15. W.R. Czart, P.R. Grzybowski, S. Robaszkiewicz, in preparation
• 16. E. Müller-Hartmann, Z. Phys. B 74, 507 (1989); W. Metzner, D. Vollhardt, Phys. Rev. Lett. 62, 324 (1989)

Identifiers

DOI

10.12693/APhysPolA.118.369