Magnetization and spin gap in two-dimensional organic ferrimagnet BIPNNBNO

A magnetization process in the two-dimensional ferrimagnet BIPNNBNO is analyzed. The compound consists of ferrimagnetic (1,1 2) chains coupled by two sorts of antiferromagnetic interaction. Whereas the behavior of the magnetization curve in higher magnetic fields can be understood within a process f...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2012-08, Vol.24 (30), p.306003-306003
Main Authors: Ovchinnikov, A S, Sinitsyn, V E, Bostrem, I G, Hosokoshi, Y, Inoue, K
Format: Article
Language:English
Subjects:
Condensed matter
Ferrimagnetism
Frustration
Joining
Magnetic fields
Magnetization
Mathematical analysis
Two dimensional
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Summary:A magnetization process in the two-dimensional ferrimagnet BIPNNBNO is analyzed. The compound consists of ferrimagnetic (1,1 2) chains coupled by two sorts of antiferromagnetic interaction. Whereas the behavior of the magnetization curve in higher magnetic fields can be understood within a process for the separate ferrimagnetic chain, the appearance of the singlet plateau at lower fields is an example of non-Lieb-Mattis type ferrimagnetism. By using the exact diagonalization technique for finite clusters of size 4 × 6, 4 × 8 and 4 × 10 we show that the interchain frustration coupling plays an essential role in stabilization of the singlet phase. These results are complemented by an analysis of four cylindrically coupled ferrimagnetic (1,1 2) chains via an Abelian bosonization technique and an effective theory based on the XXZ spin-1 2 Heisenberg model when the interchain interactions are sufficiently weak/strong, respectively.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/24/30/306003