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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2005, Volume 82, Issue 7, Pages 501–505
(Mi jetpl1583)
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This article is cited in 21 scientific papers (total in 21 papers)
CONDENSED MATTER
Pressure-induced antiferromagnetism in La0.75Ca0.25MnO3 manganite
D. P. Kozlenkoa, S. E. Kichanova, V. I. Voroninb, B. N. Savenkoa, V. P. Glazkovc, E. A. Kiselevad, N. V. Proskurninab a Joint Institute for Nuclear Research
b Institute of Metal Physics, Ural Division of the Russian Academy of Sciences
c Russian Research Centre "Kurchatov Institute"
d Ural State University
Abstract:
The crystal and magnetic structures of La0.75Ca0.25MnO3 manganite are studied under high pressures up to 4.5 GPa in the temperature range 12–300 K by the neutron diffraction method. At normal pressure and temperature T C = 240 K, a ferromagnetic state is formed in La0.75Ca0.25MnO3. At high pressures P ≥ 1.5 GPa and at temperatures T < T N ≈ 150 K, a new A-type antiferromagnetic state appears. A further increase in pressure leads to an increase in the volume fraction of the antiferromagnetic phase, which coexists with the initial ferromagnetic phase. The effect of high pressure causes a considerable increase in T C with the slope dT C /dP ≈ 12 K/GPa. Calculations performed in the framework of the double exchange model with allowance for the electron-phonon interaction make it possible to explain this pressure dependence of T C on the basis of experimental data.
Received: 17.08.2005
Citation:
D. P. Kozlenko, S. E. Kichanov, V. I. Voronin, B. N. Savenko, V. P. Glazkov, E. A. Kiseleva, N. V. Proskurnina, “Pressure-induced antiferromagnetism in La0.75Ca0.25MnO3 manganite”, Pis'ma v Zh. Èksper. Teoret. Fiz., 82:7 (2005), 501–505; JETP Letters, 82:7 (2005), 447–451
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https://www.mathnet.ru/eng/jetpl1583 https://www.mathnet.ru/eng/jetpl/v82/i7/p501
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