Specific heat of defects in the Haldane system Y2BaNiO5

被引：35

作者：

Batista, CD ^{[1
]}

Hallberg, K

Aligia, AA

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8100 SC De Bariloche, Argentina

[2] Comis Nacl Energia Atom, Inst Balseiro, RA-8100 SC De Bariloche, Argentina

来源：

PHYSICAL REVIEW B | 1998年 / 58卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.58.9248

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We calculate the specific heat C(B,T) of the antiferromagnetic spin-1 chain compound Y2BaNi1-xZnxO5 as a function of magnetic field B and temperature T. The low-energy spectrum of an anisotropic Heisenberg Hamiltonian has been solved using the density-matrix renormalization-group theory. Considering the experimental values for the parameters and an approximate model for interchain interactions the observed C(B,T) is quantitatively reproduced. For large chains (N>50) we find asymptotically free S=1/2 states. Our results are thus also consistent with electron-spin-resonance data for NENP. [S0163-1829(98)05 137-6].

引用

页码：9248 / 9251

页数：4

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