Abstract
The temperature dependence of the magnetic susceptibility of La2NiO4+δ single crystals with δ = 0.095 and 0.105 has been analyzed. The anomalous dependence of χ(T) characteristic of stripe structures previously found in La1.8Sr0.2NiO4 has been found. Investigation of the dependence χ(T) on the impurity and charge disorder degrees makes it possible to separate the contribution associated with the ordering of holes and impurity oxygen. It has been shown that the contribution from the ordering of holes is well described by the model of ferromagnetic Heisenberg chains of spins S = 1/2. The length of the chains and intrachain interaction J N have been determined from the temperature dependence χ(T).
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Original Russian Text © A.A. Nikonov, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 4, pp. 236–241.
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Nikonov, A.A. Magnetic susceptibility of La2NiO4+δ single crystals with δ = 0.095 and 0.105. Ordering of holes and ferromagnetic heisenberg chains. Jetp Lett. 85, 197–202 (2007). https://doi.org/10.1134/S0021364007040030
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DOI: https://doi.org/10.1134/S0021364007040030