Interplay between spin-crossover and magnetic interactions in a BEG model

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• 作者：T.D. Oke (1)
  F. Hontinfinde (1)
  K. Boukheddaden (2)
  
• 关键词：Solid State and Materials
• 刊名：The European Physical Journal B - Condensed Matter
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：86
• 期：6
• 全文大小：382KB
• 参考文献：1. P. Gütlich, Struct. Bonding 44, 83 (1981) CrossRef
  2. E. Konig, Struct. Bonding 76, 51 (1991) CrossRef
  3. O. Kahn, Curr. Opin. Solid State Mater. Sci. 1, 547 (1996) CrossRef
  4. S. Doniach, J. Chem. Phys. 68, 4912 (1978) CrossRef
  5. A. Bousseksou, J. Nasser, J. Linares, K. Boukheddaden, F. Varret, J. Phys. I 2, 1381 (1992) CrossRef
  6. A. Bousseksou, F. Varret, J. Nasser, J. Phys. I 3, 1463 (1993) CrossRef
  7. A. Bousseksou, J. Constant-Machado, F. Varret, J. Phys. I 5, 747 (1995) CrossRef
  8. R.R. Heikes, R.C. Miller, A. Mazelsky, Physica 30, 1600 (1964) CrossRef
  9. G.H. Jonker, J. Appl. Phys. 37, 1424 (1966) CrossRef
  10. K. Boukheddaden, J. Linarès, E. Codjovi, F. Varret, V. Niel, J.A. Real, J. Appl. Phys. 93, 1 (2003) CrossRef
  11. L. Cambi, A. Gagnasso, Atti Accad. Naz. Lincei 13, 809 (1931)
  12. S. Decurtins, P. Gütlich, C.P. K?hler, H. Spiering, A. Hausser, Chem. Phys. Lett. 105, 1 (1984) CrossRef
  13. J.J. McGarvey, I. Lawthers, J. Chem. Soc. Chem. Commun. 16, 906 (1982) CrossRef
  14. F. Volatron, L. Catala, E. Rivière, A. Gloter, O. Stephan, T. Mallah, Inorg. Chem. 47, 6584 (2008) CrossRef
  15. A. Muraoka, K. Boukheddaden, J. Linarès, F. Varret, Phys. Rev. B 84, 054119 (2011) CrossRef
  16. A. G?ndulescu, A. Rotaru, J. Linares, M. Dimian, J. Naser, J. Phys.: Conf. Ser. 268, 012007 (2011) CrossRef
  17. H. Tokoro, S.-I. Ohkoshi, K. Hashimoto, Appl. Phys. Lett. 82, 1245 (2003) CrossRef
  18. F. Varret, K. Boukheddaden, C. Chong, A. Goujon, B. Gillon, J. Jeftic, A. Hausser, Eur. Phys. Lett. 77, 30007 (2007) CrossRef
  19. J.A. Nasser, Eur. Phys. J. B 21, 3 (2001) CrossRef
  20. K. Boukheddaden, S. Miyashita, M. Nishino, Phys. Rev. B 75, 094112 (2007) CrossRef
  21. C. Enachescu, M. Nishino, S. Miyashita, A. Hausser, A. Stancu, L. Stoleriu, Eur. Phys. Lett. 91, 27003 (2010) CrossRef
  22. K. Boukheddaden, M. Nishino, S. Miyashita, F. Varret, Phys. Rev. B 72, 014467 (2005) CrossRef
  23. C. Enachescu, M. Nishino, S. Miyashita, A. Hauser, A. Stancu, L. Stoleriu, Eur. Phys. Lett. 91, 27003 (2010) CrossRef
  24. H. Tokoro, S. Miyashita, K. Hashimoto, S. Ohkoshi, Phys. Rev. B 73, 172415 (2006) CrossRef
  25. T. Kaneyoshi, I. Tamura, Phys. Rev. B 25, 4679 (1982) CrossRef
  26. A.B. Bortz, M.H. Kalos, J.L. Lebowitz, J. Comp. Phys. 17, 10 (1975) CrossRef
  27. S. Jain, / Monte Carlo simulations of disordered systems (World scientific Publishing Co. Pte. Ltd, 1992)
  28. R.J. Glauber, J. Math. Phys. 4, 294 (1963) CrossRef
  29. J. Wajnflasz, Phys. Status Solidi B 40, 537 (1970) CrossRef
  30. N. Goveas, G. Mukhopadhyay, Phys. Scr. 56, 661 (1997) CrossRef
  31. J. Adler, Ph.D. thesis, University of New South wales, 1979 (unpublished)
  32. M. Blume, V.J. Emery, R.B. Griffiths, Phys. Rev. A 4, 1071 (1971) CrossRef
  33. J. Sivadiere, J. Lazerowitch, Phys. Rev. A 11, 2079 (1975) CrossRef
  34. S.-I. Ohkshi, K. Imoto, Y. Tsunobuchi, S. Takano, H. Tokoro, Nat. Chem. 3, 448 (2011)
  35. M. Nakano, G. Matsubayashi, T. Matsuo, Phys. Rev. B 66, 212412 (2002) CrossRef
  36. R. Honmura, Phys. Rev. B 30, 348 (1984) CrossRef
  37. T. Kaneyoshi, Physica A 164, 730 (1990) CrossRef
  38. T. Kaneyoshi, J.W. Tucker, M. Jascur, Physica A 186, 495 (1992) CrossRef
  39. F. Zernike, Physica 7, 565 (1940) CrossRef
  40. T. Kaneyoshi, Physica A 182, 436 (1992) CrossRef
  41. Chin-Kun Hu, N.Sh. Izmailian, Phys. Rev. E 58, 1644 (1998) CrossRef
  42. P.D. Beale, Phys. Rev. B 33, 1717 (1986) CrossRef
  43. I. Shteto, K. Boukheddaden, F. Varret, Phys. Rev. E 60, 5139 (1999) CrossRef
  
• 作者单位：T.D. Oke (1)
  F. Hontinfinde (1)
  K. Boukheddaden (2)
  
  1. Département de Physique (FAST) et Institut des Mathématiques et de Sciences Physiques (IMSP), Universitéd’Abomey-Calavi, 01, BP 613, Porto-Novo, Benin
  2. Groupe d’Etudes de la matière condensée, Université de Versailles/St. Quentin en Yvelines-CNRS, 45 Avenue des Etats Unis, 78035, Versailles Cedex, France
  
• ISSN：1434-6036

文摘

A two-dimensional Blume-Emery-Griffiths spin-1 model with spin-phonon interaction is introduced to investigate the thermodynamic properties of Prussian Blue Analogs and Spin-crossover materials. The quadrupolar interaction parameter is assumed to depend on the temperature in the form K?=?α k B T while the crystal-field depends both on the ligand-field strength and the degeneracy ratio between high spin (HS) and low spin (LS) states as in some previous works. The model is solved by means of two statistical-mechanical methods: kinetic Monte Carlo simulations and corrective effective field theory calculations. Our calculations indicate that by tuning α, the spin-crossover transition changes to a sharp first order transition where the HS fraction, n HS changes discontinuously. Second order transitions are observed in the presence of magnetic ordering when the nearest-neighbor coupling constant J exceeds some critical value J c which depends on α and other model parameters. Below J c , simple spin-transition occurs at an equilibrium temperature T eq that is very sensitive to the values of the degenaracy ratio and the ligand-field. Competition between model parameters lead to interesting phase diagrams. Some of them are displayed for varying values of the coupling J and also in the specific case where J and K are of the same order of magnitude. Thermal hysteresis loops have been calculated by Monte Carlo simulations and also by using the self-consistent equations in the case of long-lived metastable states showing strong dependence on model parameters.