High-field magnetization of S=1 antiferromagnetic bond-alternating chain compounds

Yasuo Narumi, Koichi Kindo, Masayuki Hagiwara, Hiroki Nakano, Akira Kawaguchi, Kouichi Okunishi, and Masanori Kohno
Phys. Rev. B 69, 174405 – Published 6 May 2004
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Abstract

High-field magnetization and susceptibility measurements have been performed on S=1 antiferromagnetic bond-alternating chain compounds: [Ni2(dpt)2(μox)(μN3)](PF6) [dpt=bis(3-aminopropyl)amine, ox= C2O4] (abbreviated as NDOAP) and [Ni(333tet)(μNO2)]ClO4 [333tet=N,N-bis(3-aminopropyl)-1,3propanediamine] (abbreviated as NTENP). The magnetization of NDOAP shows two steep increases at about 200 and 500 kOe. A magnetization plateau is observed between about 300 and 500 kOe, corresponding to half the value of the saturation moment. Comparison between numerical calculations and the experimental results, including the magnetic susceptibility, shows that NDOAP has a singlet ground state due to dimerization with a bond-alternating ratio α=0.1. The half-saturation plateau is also observed around 700 kOe in the magnetization of NTENP. The magnetization process of NTENP is well reproduced by the numerical result calculated for the parameter of α=0.45 in the singlet-dimer phase. The α dependence of the magnetization processes is discussed.

  • Received 3 September 2003

DOI:https://doi.org/10.1103/PhysRevB.69.174405

©2004 American Physical Society

Authors & Affiliations

Yasuo Narumi* and Koichi Kindo

  • KYOKUGEN, Osaka University, Toyonaka, Osaka 560-8531, Japan

Masayuki Hagiwara

  • RIKEN(The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan

Hiroki Nakano

  • Graduate School of Science, Himeji Institute of Technology, Kamigori, Ako, Hyogo 678-1297, Japan

Akira Kawaguchi

  • NTT Basic Research Laboratories, Atsugi, Kanagawa 243-0198, Japan

Kouichi Okunishi

  • Faculty of Science, Niigata University, Niigata, Niigata 950-2181, Japan

Masanori Kohno

  • Computational Materials Science Center, National Institute for Materials Science, Tsukuba 305-0047, Japan

  • *Electronic address: narumi@mag.rcem.osaka-u.ac.jp

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Issue

Vol. 69, Iss. 17 — 1 May 2004

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