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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2003, Volume 78, Issue 1, Pages 30–35
(Mi jetpl2485)
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This article is cited in 2 scientific papers (total in 2 papers)
Two-dimensional quantum ferromagnet, magnetic chains, and oxygen ordering in La$_2$NiO$_{4.125}$ single crystals
A. A. Nikonov, O. E. Parfenov Russian Research Centre "Kurchatov Institute", Moscow
Abstract:
The temperature dependence of the magnetic susceptibility $\chi (T)$ 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, $\chi (T)$ obeys the dependence $\chi (T)\approx C/tT^2$, 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 $\chi (T)\approx C(T)^2\exp(4\pi JS^2/ kT)$, which is an indication of the formation of a 2D quantum Heisenberg ferromagnet.
Received: 04.06.2003
Citation:
A. A. Nikonov, O. E. Parfenov, “Two-dimensional quantum ferromagnet, magnetic chains, and oxygen ordering in La$_2$NiO$_{4.125}$ single crystals”, Pis'ma v Zh. Èksper. Teoret. Fiz., 78:1 (2003), 30–35; JETP Letters, 78:1 (2003), 25–29
Linking options:
https://www.mathnet.ru/eng/jetpl2485 https://www.mathnet.ru/eng/jetpl/v78/i1/p30
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Abstract page: | 156 | Full-text PDF : | 66 | References: | 50 |
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