Multisublattice magnetic structures in charge ordered perovskite manganites with high doping level

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Abstract

The study is devoted to the theoretical analysis of noncollinear magnetic structures of charge-ordered manganites with a doping level x=3/4, 4/5. The reasons for canted and perpendicular magnetic structures to form as a result of the competition between the orbitally dependent exchange interaction in different crystallographic directions and the influence of single-ion anisotropy are considered. The mechanism of formation of predominantly noncollinear magnetic structures is shown. Trimer stripe magnetic structures with ordering along pseudo-perovskite axes xp, yp, zp = b are predicted. The presence of magnetic structure components aligned with the b axis is assumed and methods for checking the presence of such components based on field dependencies of magnetization and antiferromagnetic resonance frequencies are proposed.

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About the authors

L. E. Gonchar

Ural State University of Railway Transport; Ural Federal University named after the First President of Russia B. N. Yeltsin

Author for correspondence.
Email: l.e.gonchar@yandex.ru
Russian Federation, 620034, Ekaterinburg; 620002, Ekaterinburg

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Supplementary files

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2. Fig. 1. The orbital-charge structure of La1/4Ca3/4MnO3 [14]. Here and in the following figures, Mn3+ ions are depicted as a distribution of electron densities, Mn4+ ions are indicated by spheres. The numbers number the sublattices of the orbital structure.

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3. Pain. 2. The orbital and charge structure of the manganese sublattice in Bi1/5Ca4/5MnO3 [15].

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4. Fig. 3. The dependence of the magnetic energy of various structures on the mixing angle of the orbital functions with the spatial distribution of orbitals in accordance with the formulas (4), (7). 1, 2 or G denote ranges of angles Θ with different types of magnetic structure.

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5. Fig. 4. Possible equilibrium magnetic structures of manganites with the orbital-charge structure “Wigner crystal”, x = 3/4, 4/5. In the adjacent ac plane, the directions of the magnetic moments are opposite. (a–c) – magnetic structures for La1/4Ca3/4MnO3; a – magnetic structure of type 1 without doubling the magnetic cell, b – magnetic structure of type 2 with the ordering of stripes along the orthorhombic axis (for example, c), c – magnetic structure of type 2 with mutually perpendicular ordering of stripes Mn4+– Mn3+– Mn4+ and one of the possible orders of the intermediate stripe; (d–e) – magnetic structures for Bi1/5Ca4/5MnO3; d – magnetic structure of type 1 without doubling the magnetic cell, d – magnetic structure of type 2 with the ordering of Mn4+– Mn3+– Mn4+ stripes along the orthorhombic axis (for example, c) and one of the possible orders of the intermediate stripe, e – a type 2 magnetic structure with a mutually perpendicular ordering of Mn4+– Mn3+– Mn4+ stripes and one of the possible orders of the intermediate stripe.

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6. Fig. 5. Distribution of magnetic sublattices in the ac plane; a – La1/4Ca3/4MnO3, in the adjacent plane the number of the sublattice increases by 16; b – Bi1/5Ca4/5MnO3, in the adjacent plane the number of the sublattice increases by 20.

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7. Pain. 6. The application of magnetic moments in the approximately-stripe structures of high-performance manganites, the applications of magnetic moments in the adjacent AC plane are opposite. Red arrows – projections of Mn3+ magnetic moments; blue arrows–projections of Mn4+ magnetic moments inside Mn4+–Mn3+ – Mn4+ stripes; green arrows – projections of Mn4+ magnetic moments in the gaps between stripes; a, b – La1/4Ca3/4MnO3; b, G-Bi1/5Ca4/5MnO3.

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