Charge ordering in crystals of Pr1? x Sr x MnO3 ( x = 0.22, 0.24) ferromagnetic manganites |
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Authors: | S F Dubinin S G Teploukhov V E Arkhipov V D Parkhomenko é A Nefeld A V Korolev N A Ugryumova and Ya M Mukovski |
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Institution: | (1) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoĭ 18, Yekaterinburg, 620219, Russia;(2) Moscow Institute of Steel and Alloys, Leninskiĭ pr. 4, Moscow, 119991, Russia |
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Abstract: | The structural and magnetic states of Pr1−x
Sr
x
MnO3 (x = 0.22, 0.24) manganite crystals were studied over a wide temperature range. Measurements of the magnetic susceptibility
and electrical resistivity demonstrated that these manganites belong to the class of ferromagnetic semiconductors. Thermal
neutron elastic scattering patterns revealed that, in the temperature range 4.2–350 K, the manganites have an orthorhombic
structure (space group Pnma) with a well-pronounced cooperative Jahn-Teller effect. Major emphasis was placed on the nuclear magnetic superstructure
with a wave vector q = (2π/2a, 0, 2π/2c). It was shown that this superstructure suggests 1/4-type charge ordering in the manganites under investigation.
Original Russian Text ? S.F. Dubinin, S.G. Teploukhov, V.E. Arkhipov, V.D. Parkhomenko, é.A. Neĭfel’d, A.V. Korolev, N.A.
Ugryumova, Ya.M. Mukovskiĭ, 2007, published in Fizika Tverdogo Tela, 2007, Vol. 49, No. 4, pp. 704–710. |
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