Canted spin structure in clusters of the (La0.7Ca0.3)1−xMn1+xO3 perovskites

Dyakonov, V. P.; Fita, I.; Zubov, E.; Pashchenko, V. P.; Mikhaylov, Vasily I.; Prokopenko, V. K.; Bukhantsev, Yu.; Arciszewska, Μ.; Dobrowolski, W.; Szymczak, H.

doi:10.1016/s0304-8853(02)00020-3

Cited by 26 publications

(9 citation statements)

References 34 publications

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“…These results are in agreement with the magnetic data reported in Ref. [2]. Above T t the ferromagnetic order is stable.…”

Section: Discussionsupporting

confidence: 93%

“…With increase of Ca content the change of the properties from an antiferromagnetic insulator for x = 0, through a ferromagnetic insulator, to a ferromagnetic metallic for 0.2 ≤ x ≤ 0.5 is observed [1]. La 0.7 Ca 0.3 MnO 3 is a collinear ferromagnet up to the Curie temperature T c = 265 K. In (La 0.7 Ca 0.3 ) 1-x Mn 1+x O 3 samples (x = 0.1; 0.2), the magnetic measurements indicate an additional anomaly at T t = 45 K [2].In this work the results of neutron diffraction measurements as a function of temperature for (La 0.7 Ca 0.3 ) 1-x Mn 1+x O 3 (x = 0, 0.1) samples are presented. From these data the parameters of the crystal and magnetic structure are determined.…”

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confidence: 94%

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Neutron diffraction study of crystal and magnetic structure of (La_0.7Ca_0.3)_1–xMn_1+xO₃ (x = 0, 0.1) systems

Bażela

Dyakonov

Pashchenko

et al. 2003

Physica Status Solidi (b)

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PACS 75.25.+z, 75.50.Dd The evolution of crystal and magnetic structures of (La 0.7 Ca 0.3 ) 1-x Mn 1+x O 3 (x = 0, 0.1) as a function of temperature was determined. For both compounds the crystal structure is orthorhombic (space group Pnma) with the following sequence of the lattice constants: b/ 2 < a < c for x = 0 and c < a < b/ 2 for x = 0.1. The para-ferromagnetic transitions at T c = 265 K for x = 0 and 260 K for x = 0.1 are accompanied by structural distortions. For x = 0 the ferromagnetic ordering of the Mn moments equal to 3.57(10)µ B and parallel to the b-axis is stable in the temperature range from 1.5 K to T c . For x = 0.1 at 1.5 K the magnetic order has two components: the ferromagnetic one with the magnetic moment µ = 3.46(12)µ B parallel to the b-axis and the antiferromagnetic one with µ = 0.66(23)µ B parallel to the c-axis. This order is stable up to T t = 45 K. Then the ferromagnetic order only exists up to T c = 260 K. These results correlate well with macroscopic magnetic data. At T c and T t the anomalies in the thermal dependence of Mn-O bond lengths and Mn -O -Mn bond angles are observed. IntroductionAn intense research effect has recently been devoted to studying the interplay between structure, magnetism and transport in manganese perovskites La 1-x Ca x MnO 3 . With increase of Ca content the change of the properties from an antiferromagnetic insulator for x = 0, through a ferromagnetic insulator, to a ferromagnetic metallic for 0.2 ≤ x ≤ 0.5 is observed [1]. La 0.7 Ca 0.3 MnO 3 is a collinear ferromagnet up to the Curie temperature T c = 265 K. In (La 0.7 Ca 0.3 ) 1-x Mn 1+x O 3 samples (x = 0.1; 0.2), the magnetic measurements indicate an additional anomaly at T t = 45 K [2].In this work the results of neutron diffraction measurements as a function of temperature for (La 0.7 Ca 0.3 ) 1-x Mn 1+x O 3 (x = 0, 0.1) samples are presented. From these data the parameters of the crystal and magnetic structure are determined.

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“…These results are in agreement with the magnetic data reported in Ref. [2]. Above T t the ferromagnetic order is stable.…”

Section: Discussionsupporting

confidence: 93%

mentioning

confidence: 94%

Neutron diffraction study of crystal and magnetic structure of (La_0.7Ca_0.3)_1–xMn_1+xO₃ (x = 0, 0.1) systems

Bażela

Dyakonov

Pashchenko

et al. 2003

Physica Status Solidi (b)

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“…[12,13]. Detailed synthesis procedure as well as the crystal-structure characterization of the samples are also described in Refs.…”

Section: Methodsmentioning

confidence: 99%

“…The magnetic properties of these manganite oxides are dened rst of all by the variation of the double exchange interaction between the Mn 3+ and Mn 4+ ions arising from change in the Mn 3+ /Mn 4+ ratio as a result of Mn content change. The compounds with an excess of manganese are of interest as materials, having the second-order paramagnetic-ferromagnetic phase transition close to a rst-order one and the Curie temperature (T C ) close to room temperature [12,13], whose magnetic entropy can be controlled by varying Mn content. These properties make the manganites studied excellent candidates as working materials in magnetic refrigerators.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nonstoichiometry on Magnetocaloric Effect in (La_0.7Ca_0.3)_{1 - x}Mn_1+xO₃

et al. 2012

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Magnetocaloric eect in (La0.7Ca0.3)1−xMn1+xO3 manganites with x = 0, 0.1, 0.2 has been investigated. It is found a strong inuence of nonstoichiometry caused by excessive manganese on the magnetic entropy change. The magnetocaloric eect was evaluated from the isothermal curves of spontaneous magnetization versus the applied magnetic eld by using the well-known thermodynamical Maxwell relation. The maximum entropy value,

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“…Ceramic samples of lanthanum manganate are commonly produced by a conventional ceramic method or coprecipitation [2,6]. We selected coprecipitation because it provides better homogenization of the initial charge than the ceramic method does.…”

Section: Introductionmentioning

confidence: 99%

Effect of cold isostatic pressing on the synthesis and particle size of lanthanum manganate

Prilipko

Timchenko

Akimov

et al. 2008

Powder Metall Met Ceram

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539.89 X-ray diffraction and thermogravimetry are used to examine the influence of temperature and cold isostatic pressing on the synthesis and crystalline growth of lanthanum manganate. Coprecipitated La 0.7 Mn 1.3 O 3±Δ samples compacted under different pressures before synthesis are examined. It is shown that pressing promotes synthesis, decreases its temperature, and retards crystalline growth. The results demonstrate that cold isostatic pressing is promising for obtaining nanocrystalline manganates.

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Canted spin structure in clusters of the (La0.7Ca0.3)1−xMn1+xO3 perovskites

Cited by 26 publications

References 34 publications

Neutron diffraction study of crystal and magnetic structure of (La_0.7Ca_0.3)_1–xMn_1+xO₃ (x = 0, 0.1) systems

Neutron diffraction study of crystal and magnetic structure of (La_0.7Ca_0.3)_1–xMn_1+xO₃ (x = 0, 0.1) systems

Influence of Nonstoichiometry on Magnetocaloric Effect in (La_0.7Ca_0.3)_{1 - x}Mn_1+xO₃

Effect of cold isostatic pressing on the synthesis and particle size of lanthanum manganate

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Canted spin structure in clusters of the (La0.7Ca0.3)1−xMn1+xO3 perovskites

Cited by 26 publications

References 34 publications

Neutron diffraction study of crystal and magnetic structure of (La0.7Ca0.3)1–xMn1+xO3 (x = 0, 0.1) systems

Neutron diffraction study of crystal and magnetic structure of (La0.7Ca0.3)1–xMn1+xO3 (x = 0, 0.1) systems

Influence of Nonstoichiometry on Magnetocaloric Effect in (La0.7Ca0.3)1 - xMn1+xO3

Effect of cold isostatic pressing on the synthesis and particle size of lanthanum manganate

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Product

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Neutron diffraction study of crystal and magnetic structure of (La_0.7Ca_0.3)_1–xMn_1+xO₃ (x = 0, 0.1) systems

Neutron diffraction study of crystal and magnetic structure of (La_0.7Ca_0.3)_1–xMn_1+xO₃ (x = 0, 0.1) systems

Influence of Nonstoichiometry on Magnetocaloric Effect in (La_0.7Ca_0.3)_{1 - x}Mn_1+xO₃