Il Nuovo Cimento D

, Volume 19, Issue 6, pp 797–815 | Cite as

An analysis of the T⊗(e+e) two-mode Jahn-Teller system with strong coupling

  • K. Meknassi
  • S. Sayouri


Details of an approach for strongly coupled orbital triplet Jahn-Teller (JT) systems using a unitary transformation and energy minimization procedure are applied to the two-mode T⊗ (e+e) JT system in the case when both linear and quadratic coupling are included. The inclusion of quadratic JT coupling leads to a partial lift of degeneracy of the triplet ground states and the excited ones. The effect of static strains in strongly coupled T⊗ (e+e) JT system is also investigated analytically. We have shown that tetragonal trigonal and orthorhombic strains modify the structure of the system.

PACS 71.70

Level splitting and interactions 


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  1. [1]
    Ham F. S.,Jahn-Teller effect nin electron paramagnetic resonance spectra, inParamagnetic Resenance, edited byS.Geschwind (Plenum, New York) 1972, pp. 1–119.Google Scholar
  2. [2]
    Bates C. A.,Phys. Rep.,35 (1978) 187.CrossRefADSGoogle Scholar
  3. [3]
    Perlin Yu. E. andWagner M.,The Dynamical Jahn-Teller Effect in Localised Systems (North-Holland, Amsterdam) 1984.Google Scholar
  4. [4]
    Bersuker I. B. andPolinger V. Z.,Vibronic Interaction in Molecules and Crystals (Springer, Berlin) 1989.Google Scholar
  5. [5]
    Sakamoto N.,Phys. Rev. B,26 (1982) 6438.CrossRefADSGoogle Scholar
  6. [6]
    O’Brien M. C. M.,Phys. Rev.,187 (1969) 407.CrossRefADSGoogle Scholar
  7. [7]
    Vogel E. E. andMualin O.,Phys. Rev. B,50 (1994) 5231.CrossRefADSGoogle Scholar
  8. [8]
    Martinlli L.,Passaro M. andPastori PARRAVICINI G.,Phys. Rev. B,39 (1989) 13343.CrossRefADSGoogle Scholar
  9. [9]
    Sobolewski Anderzej L.,Chem. Phys. Lett.,248 (1996) 386.CrossRefADSGoogle Scholar
  10. [10]
    Colignon D.,Kartheuser E.,Rodriguez S. andVillert M.,Phys. Rev. B,51 (1995) 4849.CrossRefADSGoogle Scholar
  11. [11]
    Telahun T.,Scherz U.,Thrian P.,Heitz R.,Hoffmann A. andBroser I.,Phys. Rev. B,53 (1996) 1274.CrossRefADSGoogle Scholar
  12. [12]
    Testelin C.,Rigaux C.,Mauger A.,Mycielski A. andJulien C.,Phys. Rev. B,46 (1992) 2183.CrossRefADSGoogle Scholar
  13. [13]
    Halley J. W. andWang X. R.,Mod. Phys. Lett. B,8 (1994) 1319.CrossRefADSGoogle Scholar
  14. [14]
    MANINI N. andTOSSATTI ERIO, Con-Mat/9506038, I.C.T.P, Trieste, Italy.Google Scholar
  15. [15]
    Englman R.,The Jahn-Teller Effect in Molecules and Crystals (Wiley, London) 1972.Google Scholar
  16. [16]
    Bersuker I. B.,Vekhter B. G.,Ferroelectrics,19 (1978) 137.Google Scholar
  17. [17]
    Dunn J. L.,J. Phys. C,21 (1988) 383.CrossRefADSGoogle Scholar
  18. [18]
    Bersuker I. B. andPolinger V. Z.,Sov. Phys. JETP,39 (1974) 1023.ADSGoogle Scholar
  19. [19]
    Sakamoto N.,J. Phys. C,15 (1982) 6379.CrossRefADSGoogle Scholar
  20. [20]
    Bates C. A.,Dunn J. L. andSigmund E.,J. Phys. C,20 (1987) 1965 (Erratum,20 (1987) 4015).CrossRefADSGoogle Scholar
  21. [21]
    Ham F. S.,Phys. Rev. A,138 (1965) 1727.CrossRefADSGoogle Scholar
  22. [22]
    Schultz M. J. andSilbey T. R.,J. Phys. C,7 (1974) L325.CrossRefADSGoogle Scholar
  23. [23]
    Schultz M. J. andSilbey T. R.,J. Chem. Phys.,65 (1976) 4375.CrossRefADSGoogle Scholar
  24. [24]
    Maier J. andSigmund E.,Solid State Commun.,51 (1984) 961.CrossRefADSGoogle Scholar
  25. [25]
    Stauss G. H. andKrebs J. J.,Phys. Rev. B,22 (1980) 2050.CrossRefADSGoogle Scholar
  26. [26]
    Ramdane A.,Salce B. andChallis L. J.,Phys. Rev. B,27 (1983) 2554.CrossRefADSGoogle Scholar
  27. [27]
    Bates C. A. andStevens K. W. H.,Rep. Prog. Phys,49 (1986) 783.CrossRefADSGoogle Scholar
  28. [28]
    Cousins C. S. G.,J. Phys. C,14 (1981) 4553.CrossRefADSGoogle Scholar
  29. [29]
    Bersuker I. B. andPolinger V. Z.,Phys. Status Solidi B,60 (1973) 85.CrossRefADSGoogle Scholar
  30. [30]
    DUNN J. L., PhD Thesis University of Nottingham 1987.Google Scholar
  31. [31]
    Dunn J. L.,J. Phys. C,21 (1988) 2495.CrossRefADSGoogle Scholar

Copyright information

© Società Italiana di Fisica 1997

Authors and Affiliations

  • K. Meknassi
    • 1
  • S. Sayouri
    • 1
  1. 1.Département de Physique, Faculté des Sciences B.P.Laboratoire de Physique des SolidesAtlasMorocco

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