Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-06-30
Journal of Low Temparature Physics 117, 389-393 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, LaTex,2 figures
Scientific paper
We examine two-spin (2S) and cyclic four-spin (4S) magnetic interactions in insulating ladder and two-dimensional (2D) cuprates. By a comparison of eigenstates between d-p and Heisenberg models, we evaluate magnitudes of these interactions. We find that the 4S interaction is $\sim$10% of nearest neighboring 2S interaction, and a diagonal 2S interaction is considerably small. The 4S interaction for a ladder cuprate is larger than that for 2D one, and plays an important role in the low-energy excitation. The Heisenberg ladder with the obtained 2S and 4S interactions reproduces very well the experimental result of the temperature dependence of the magnetic susceptibility.
Maekawa Sadamichi
Mizuno Yoshiaki
Tohyama Takami
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