Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-05-13
Physics
Condensed Matter
Strongly Correlated Electrons
Revtex, 6 pages, 5 Postscript figures (include)
Scientific paper
10.1103/PhysRevB.58.9166
We improved the decoupling approximation of the double-time Green's function theory, and applied it to study the spin-${1\over 2}$ two-dimensional antiferromagnetic Heisenberg model with broken bonds at finite temperature. Our decoupling approximation is applicable to the spin systems with spatial inhomogeneity, introduced by the local defects, over the whole temperature region. At low temperatures, we observed that the quantum fluctuation is reduced in the neighborhood of broken bond, which is in agreement with previous theoretical expectations. At high temperatures our results showed that the quantum fluctuation close to the broken bond is enhanced. For the two parallel broken bonds cases, we found that there exists a repulsive interaction between the two parallel broken bonds at low temperatures.
Lin Hai-Qing
Shen Jue-Lian
Song Yun
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