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Haldane spin state in Y2Ba(Ni, Zn or Mg)O5

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0921-4526(94)90416-2

Abstract

Abstract We have identified Y 2BaNiO 5 as a new Haldane state chain compound with a magnetic excitation gap Δ min/k B of 100±5K and Δ min/|J|≈0.3. Single crystal results of χ(T→0) reveal a splitting of the excited magnetic state. The S=1 chains have been severed in a controlled way by the substitution of Zn or Mg for Ni, and the resulting modifications of χ(T) are presented.

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