Spin dynamics of hole-doped Y2BaNiO5

被引：22

作者：

Batista, CD ^{[1
]}

Aligia, AA

Eroles, J

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 Bariloche, Rio Negro, Argentina

[2] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 Bariloche, Rio Negro, Argentina

来源：

EUROPHYSICS LETTERS | 1998年 / 43卷 / 01期

关键词：

D O I：

10.1209/epl/i1998-00321-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Starting from a multiband Hamiltonian containing the relevant Ni and O orbitals, we derive an effective Hamiltonian H-eff for the low-energy physics of doped Y2BaNiO5. For hole doping, H-eff describes O fermions interacting with S = 1 Ni spins in a chain, and cannot be further reduced to a simple one-band model. Using numerical techniques, we obtain a dynamical spin structure factor with weight inside the Haldane gap. The nature of these low-energy excitations is identified and the emerging physical picture is consistent with most of the experimental information on Y2 - xCaxBaNiO5.

引用

页码：71 / 76

页数：6

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