Non-Heisenberg couplings and ferromagnetic instability in a random antiferromagnetic spin-1 chain

Journal of Applied Physics

Volumn 83, Issue 11, 1998, Pages 7231-7233

  Bhatt, R N ^a   Yang, Kun ^b  

^a Princeton University   (United States)

^b CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000599908     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.367612     Document Type: Article

References (14)

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12. 2+, we have two holes instead of two electrons in the 3d shell, but the physics should be the same.
13. In real systems the hopping matrix element depends on the specific orbitals involved and may be zero for certain pairs of orbitale due to symmetry. To simplify the algebra, we assume it is t for hopping between the same orbitale and t′ for different orbitale; these may be taken to be the average values of the two. The results are not altered qualitatively by this simplification.
14. In principle, when V is small compared to t, the straightforward nondegenerate perturbation expansion needs to be modified. However, the final answer will be of the same order of magnitude as that obtained from the perturbation calculation.