Spin dynamics of hole-doped Y2BaNiO5

Europhysics Letters

Volumn 43, Issue 1, 1998, Pages 71-76

  Batista, C D ^a   Aligia, A A ^a   Eroles, J ^a  

^a INSTITUTO BALSEIRO   (Argentina)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0032122597     PISSN: 02955075     EISSN: None     Source Type: Journal    
DOI: 10.1209/epl/i1998-00321-x     Document Type: Article

References (29)

1. HALDANE F. D. M., Phys. Rev. Lett., 50 (1983) 1153; Phys. Lett. A, 93 (1983) 464.
2. HALDANE F. D. M., Phys. Rev. Lett., 50 (1983) 1153; Phys. Lett. A, 93 (1983) 464.
3. AFFLECK I. et al., Phys. Rev. Lett., 59 (1987) 799.
4. BUYERS W. J. L. et al., Phys. Rev. Lett., 56 (1986) 371; RENARD J. P. et al., Europhys. Lett., 3 (1987) 945; KATSUMATA K. et al., Phys. Rev. Lett., 63 (1989) 86.
5. BUYERS W. J. L. et al., Phys. Rev. Lett., 56 (1986) 371; RENARD J. P. et al., Europhys. Lett., 3 (1987) 945; KATSUMATA K. et al., Phys. Rev. Lett., 63 (1989) 86.
6. BUYERS W. J. L. et al., Phys. Rev. Lett., 56 (1986) 371; RENARD J. P. et al., Europhys. Lett., 3 (1987) 945; KATSUMATA K. et al., Phys. Rev. Lett., 63 (1989) 86.
7. WHITE S. R. and HUSE D. A., Phys. Rev. B, 48 (1993) 3844; JOLICOEUR T. and LACAZE R., Phys. Rev. B, 50 (1994) 3037.
8. WHITE S. R. and HUSE D. A., Phys. Rev. B, 48 (1993) 3844; JOLICOEUR T. and LACAZE R., Phys. Rev. B, 50 (1994) 3037.
9. XU G. et al., Phys. Rev. B, 54 (1996) R6827.
10. RAMIREZ A. P., CHEONG S. W. and KAPLAN M. L., Phys. Rev. Lett., 72 (1994) 3108.
11. DI TUSA J. F. et al., Phys. Rev. Lett., 73 (1994) 1857.
12. KOJIMA K. et al., Phys. Rev. Lett., 74 (1995) 3471.
13. LU Z. Y., SU Z. B. and LU YU, Phys. Rev. Lett., 74 (1995) 4297.
14. SORENSEN E. S. and AFFLECK I., Phys. Rev. B, 51 (1995) 16115.
15. PENC K. and SHIBA H., Phys. Rev. B, 52 (1995) R715.
16. DAGOTTO E. et al., Phys. Rev. Lett., 76 (1996) 1731.
17. On general physical grounds, one expect the interaction between two S = 1 Ni spins to be nearly a quarter of that between two S = 1/2 Cu spins in the cuprates, while t should be of the same order of magnitude. This leads to [17, 19, 20]: J ∼ 0.03 eV (in rough agreement with experiment [5-7]), t ∼ 0.4 eV in 2D and t ∼ 0.85 eV in 1D (see ALIGIA A. A., GAGLIANO E. R. and VAIRUS P., Phys. Rev. B, 52 (1995) 13601).
18. BALA J., OLÉS A. M. and ZAANEN J., Phys. Rev. Lett., 72 (1994) 2600.
19. K approximately.
20. VAN ELP J. et al., Phys. Rev. B, 45 (1992) 1612.
21. HYBERTSEN M. S. et al., Phys. Rev. B, 45 (1992) 10032.
22. eff (eq. (2) for N ≥ 0 and eq. (3) with J′ = 0, and t = -0.351 eV for N = -1).
23. a) SCHÜTTLER H. B. and FEDRO A. J., Phys. Rev. B, 45 (1992) 7588;
24. b) SIMON M. E. and ALIGIA A. A., Phys. Rev. B, 52 (1995) 7701;
25. c) FEINER L. F., JEFFERSON J. H. and RAIMONDI R., Phys. Rev. B, 53 (1996) 8751, and references therein.
26. ALIGIA A. A., SIMON M. E. and BATISTA C. D., Phys. Rev. B, 49 (1994) 13061.
27. BATISTA C. D. and ALIGIA A. A., Phys. Rev. B, 47 (1993) 8929. See also EROLES J., BATISTA C. D. and ALIGIA A. A., Physica C, 261 (1996) 237 and references therein.
28. BATISTA C. D. and ALIGIA A. A., Phys. Rev. B, 47 (1993) 8929. See also EROLES J., BATISTA C. D. and ALIGIA A. A., Physica C, 261 (1996) 237 and references therein.
29. It is possible that a more complicated one-band Hamiltonian, including quadruplet corrections [19b, c], three-site terms, and hoppings and interactions at larger distances, describes adequately the physics below the Haldane gap. This issue is beyond our scope.