Abstract
Giant volume magnetostriction (GVM) is detected near the Curie temperature T C in La1−x AxMnO3 single crystals (A = Ca, Sr, Ba, 0.1 ≤ x ≤ 0.3) and above T C in La1−x AgyMnO3 (x = y = 0.15, 0.2 and x = 0.2, y = 0.1) ceramics (in the latter system, giant volume magnetostriction attains a value of 6.5 × 10−4 in a magnetic field of 8.2 kOe). The behavior of GVM and colossal magnetoresistance (CMR) is found to be the same: both quantities have negative values, the temperature dependences of their absolute values pass through a peak, and the isotherms do not exhibit saturation up to the maximal measuring fields of 130 kOe. In compounds with compositions La0.7Ba0.3MnO3 and La0.85Ag0.15MnO3, GVM and CMR were observed at room temperatures (in a magnetic field of 8.2 kOe, GVM attains values of 2.54 × 10−4 and 2 × 10−4 and CMR is equal to 11.6 and 11.2%, respectively). Both phenomena are attributed to the presence of a magnetic (ferromagnetic-antiferromagnetic) two-phase state in these systems, which is associated with a strong s-d exchange. It is found that the maximum value of the GVM in single crystals of La1−x AxMnO3 (A = Ba, Sr, Ca, Ag) depends on the radius R A of cation A (it is the higher, the larger the difference \(|R_A - R_{LA^{3 + } } |\)). The only exception is the compound with A = Ag, in which the pattern is complicated by additional defectiveness. Local disorder in the La1−x Ax sublattice, which is associated with the presence of cations with different radii, leads to a displacement of oxygen ions and to crystal lattice softening. The exchange s-d interactions in La1−x AxMnO3 (A = Ca, Sr, Ba, Ag) are found to be comparable with electrostatic interactions ensuring the existence of the crystal; this facilitates manifestation of the GVM.
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Original Russian Text © L.I. Koroleva, R.V. Demin, A. V. Kozlov, D.M. Zashchirinskiĭ, Ya.M. Mukovskiĭ, 2007, published in Zhurnal Eksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 131, No. 1, pp. 85–96.
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Koroleva, L.I., Demin, R.V., Kozlov, A.V. et al. Relation between giant volume magnetostriction, colossal magnetoresistance, and crystal lattice softening in manganites La1−x AyMnO3 (A = Ca, Ag, Ba, Sr). J. Exp. Theor. Phys. 104, 76–86 (2007). https://doi.org/10.1134/S1063776107010098
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DOI: https://doi.org/10.1134/S1063776107010098