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The temperature dependence of the magnetic susceptibility χ( T ) is studied in the region of the magnetic and charge ordering of La 2 NiO 4.125 single crystals that differ in the degree of ordering of the excess oxygen. In the absence of the ordering of the excess oxygen, χ( T ) obeys the dependence χ ( T )≈ C/tT 2 , which is explained by the formation of 1D FM Heisenberg chains of impurity states with S =1/2. The ordering of oxygen creates favorable conditions for the formation of 2D FM Heisenberg lattices of impurity states with S =1/2 that obey the exponential dependence χ( T )≈ C(T ) 2 exp(4π JS 2 / kT ), which is an indication of the formation of a 2D quantum Heisenberg ferromagnet.
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Никонов et al. (2003) studied this question.
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