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2000 | 97 | 3 | 579-582
Article title

Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}

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EN
Abstracts
EN
In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k_{B}=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k_{B}=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.
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EN
Contributors
author
  • Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
author
  • Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
author
  • Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
  • Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany
author
  • Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia
References
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bwmeta1.element.bwnjournal-article-appv97z354kz
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