Spin Defects in Spin-Peierls Systems

Details Spin Defects in Spin-Peierls Systems Spin Defects in Spin-Peierls Systems

1997-05-15

arxiv.org/abs/cond-mat/9705145v1

Physics

Condensed Matter

Strongly Correlated Electrons

jpsj style, 11 pages, 2 figures

Scientific paper

10.1143/JPSJ.66.3962

We examine spin-Peierls systems in the presence of spin defects which are introduced by replacing magnetic ions $Cu^{2+}$ with non-magnetic ones $Zn^{2+}$ in $CuGeO_3$. By using the action for the bosonized Hamiltonian, it is shown directly that the antiferromagnetic state induced by the spin defects coexists with the spin-Peierls states. Further the doping dependences of both transition temperature of spin-Peierls state and the spin gap have been calculated. The transition temperature of the present estimation shows good agreement quantitatively with that observed in $Cu_{1-\de} Zn_\de O_3$ for the region of the doping rate, $\de<0.02$.

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