Low-temperature magnetic behavior of the rare-earth cobaltites GdCoO3 and SmCoO3

Ivanovа, Natalia; Kazak, N. V.; Michel, Carlos R.; Balaev, A. D.; Овчинников, С. Г.

doi:10.1134/s1063783407110182

Cited by 35 publications

(22 citation statements)

References 25 publications

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“…For Sm 3+ , the crystalline-electric-field has a stronger impact on magnetism than for Pr 3+ , because of more closely spaced multiplets leading to J-mixing effects [24]. This generally yields a substantial temperature-independent paramagnetic (TIP) contribution, which can be predominant around RT [25,28] [29,30], but it can be neglected in a first approximation owing to its smallness.…”

Section: Uncertainty Affecting the (T) Datamentioning

confidence: 99%

Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

Guillou

Bréard

Hardy

2013

Solid State Sciences

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Pr 0.7 Sm 0.3 ) 0.7 Ca 0.3 CoO 3 belongs to a class of cobalt oxides undergoing a first-order transition (T*  90 K) associated to a coupled change in the valence and spin-state degrees of freedom. The Curie-Weiss regime present around room temperature (T >> T*) was analysed in detail to address the controversial issue of the cobalt spin states above the transition. This magnetic investigation indicates that the Co 4+ are in an intermediate spin-state, while the Co 3+ are in a mixed state combining low-spin and high-spin states. These results are discussed with respect to the literature on related compounds and recent results of x-ray absorption spectroscopy.

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Section: Uncertainty Affecting the (T) Datamentioning

confidence: 99%

Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

Guillou

Bréard

Hardy

2013

Solid State Sciences

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“…For example, the superconductive YBa 2 Cu 3 O 7-x phase can be obtained by decomposition of mixed solutions of acetates or trifluoroacetates of the corresponding metals followed by homogenizing annealing, [8] and polycrystalline samples of GdCoO 3 and SmCoO 3 can be obtained from cobalt nitrate and a nitrate of the appropriate rare-earth element. [9] Lately, complex oxide materials have often been obtained from heterometallic complexes with organic ligands. [10] Precursors of this kind provide several advantages: the composition of the precursor complex for the generation of a complex oxide by thermolysis can be predefined at the chemical assembly stage (in particular, in terms of the metal ratio), the removal of the organic ligands requires low temperatures (ca.…”

Section: Introductionmentioning

confidence: 99%

The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

et al. 2015

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The reactions of CuSO4·5H2O and Ba(R2mal) [R2mal2– is the dianion of 1,1‐cyclopropanedicarboxylic acid (H2Cpdc), 1,1‐cyclobutanedicarboxylic acid (H2Cbdc), or butylmalonic (H2Bumal) acid] in water give crystals of the 3D coordination polymers [BaCu(Cpdc)2]n (1), [BaCu(Cbdc)2(H2O)]n (2) and [Ba3Cu3(Bumal)6(H2O)11]n·2n(H2O) (3). The heating of 2 in air to 200 °C for 60 min results in the removal of the coordinated water molecules to give anhydrous [BaCu(Cbdc)2]n (4). The structures of 1–3 were determined by single‐crystal XRD, and that of 4 was derived from powder XRD (XPRD) data. It was assumed that the crystal structures of the polymer complexes that we isolated were determined, to a considerable extent, by the nature of the substituent of the dicarboxylic acid. For 2, the dicarboxylic acid contains closed cyclic moieties, which are retained during dehydration to give 4. A comparative study of the thermal decomposition processes and thermal kinetics of 1–3 showed that the dehydration proceeds by a single scheme, and the bonds between the structural moieties in the anhydrous intermediates become stronger. The thermal destruction of the anhydrous compounds 1, 4 and {3} [the dehydrated intermediate of the thermal decomposition of 3, as proved by thermogravimetric analysis (TGA) data] occurs above 170 °C. The phase compositions of their solid products are determined by the thermolysis conditions, and the formation of BaCuO2 from 3 can be realized under milder conditions than those for the formation from 1 and 2.

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“…Comprehensive investigations of the magnetic and electrical properties of GdCoO 3 in the temperature range 4.2-300 K were considered in [9,10]. It was found that the behavior of GdCoO 3 in this tempera ture range is close to the behavior of a set of free Gd 3+ ions.…”

Section: Resultsmentioning

confidence: 98%

Contribution of Co3+ ions to the high-temperature magnetic and electrical properties of GdCoO3

Дудников

Овчинников

Orlov

et al. 2012

J. Exp. Theor. Phys.

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The temperature dependence of the static magnetization of polycrystalline rare earth cobaltite GdCoO 3 is measured in the temperature range 2-800 K. The magnetic behaviors of GdCoO 3 and Gd 3+ are found to be different at temperatures above room temperature, which is caused by the appearance of a con tribution from Co 3+ ions at high temperatures. The temperature dependence of the magnetic susceptibility of GdCoO 3 is determined by the magnetization of rare earth gadolinium ions and the additional paramagnetic contribution induced by the thermally excited magnetic terms of Co 3+ ions. The LDA + GTB method is used to calculate the electronic structure of GdCoO 3 in the temperature range 0-300 K with allowance for strong electron correlations. The energy spectrum of GdCoO 3 is found to have intragap states that decrease the dielectric gap width with increasing temperature. DUDNIKOV et al. J J J J J J With the LDA + GTD method, we calculated the band structure of GdCoO 3 . The energy spectrum of GdCoO 3 was found to have intragap states caused by

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Low-temperature magnetic behavior of the rare-earth cobaltites GdCoO3 and SmCoO3

Cited by 35 publications

References 25 publications

Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

Contribution of Co3+ ions to the high-temperature magnetic and electrical properties of GdCoO3

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Low-temperature magnetic behavior of the rare-earth cobaltites GdCoO3 and SmCoO3

Cited by 35 publications

References 25 publications

Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

Cobalt spin state above the valence and spin-state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3

The Use of Malonate Coordination Polymers with CuII and BaII Atoms for Barium Cuprate Preparation

Contribution of Co3+ ions to the high-temperature magnetic and electrical properties of GdCoO3

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The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation