High-Tc Superconducting Oxide Solid Solutions (La1−x(Ba,Sr,Ca)x)2CuO4−δ

Kishio, K.; Sugii, Nobuyuki; Kanbe, Shinsaku; Fueki, Kazuo; Takagi, H.; Tanaka, Shōji

doi:10.1246/cl.1987.635

Cited by 36 publications

(3 citation statements)

References 9 publications

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“…R ock-salt structure LaO is recognized as an insulating block layer embedded in mother compounds of high-temperature superconducting layered perovskite cuprates (La,M) 2 CuO 4 (M = Ba, Sr). 1,2 On the other hand, lanthanum monoxide bulk polycrystal, synthesized several decades ago, has shown ordinary metallic conduction, 3,4 and further investigations have been scarcely seen, probably due to its poor chemical stability. Recently, various rare-earth monoxide epitaxial thin films have been synthesized through state-ofthe-art oxide thin-film epitaxy, unveiling unique electronic functionalities in rare-earth monoxides.…”

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confidence: 99%

Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

et al. 2018

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We report a superconducting transition in a LaO epitaxial thin film with the superconducting transition onset temperature ( T) at around 5 K. This T is higher than those of other lanthanum monochalcogenides and opposite to their chemical trend: T = 0.84, 1.02, and 1.48 K for LaX (X = S, Se, Te), respectively. The carrier control resulted in a dome-shaped T as a function of electron carrier density. In addition, the T was significantly sensitive to epitaxial strain in spite of the highly symmetric crystal structure. This rock-salt superconducting LaO could be a building block to design novel superlattice superconductors.

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confidence: 99%

Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

et al. 2018

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“…A technique has been known to substitute a cation with different chemical valence for the host cation in the oxide in order to change the chemical valence of the transition metal ion. The technique has quite often been used in the researches for the superconducting oxides, e.g., M x La 2Àx CuO 4Ày (M = Ba, Sr, Ca, Na) (1)(2)(3) and Ce x Ln 2Àx CuO 4Ày (Ln = Pr, Nd, Sm, Eu) (4)(5)(6). In these cases, La 2 CuO 4 and Ln 2 CuO 4 (Ln = Pr, Nd, Sm, Eu) are called the Mott insulator (7).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure and Physical Properties of Li Mg0.857−Cu2.143O3−

Tsuchiya

Ohishi

2002

Journal of Solid State Chemistry

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“…Since the discovery of the 35K superconducting (La, Ba) 2 CuO 4 compound (Bednorz and Muller, 1986), there has been a great deal of interest in the research of this and related materials. It was found that a substitution of the trivalent La ions by divalent Sr ions in La 2x Sr x CuO 4 (x~0.15) improved the superconducting transition temperatures with T c (onset) above 37K (Kishio et al, 1987;Cava et al, 1987). The La 2 .…”

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confidence: 99%

A Study of the Superconducting La_2-xSr_xCuO₄ System by X-Ray Powder Diffraction

et al. 1989

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Room temperature crystalline structures of La2-xSrxCuO4 samples with uncommonly high hole concentrations (p) up to p=0.4, annealed under 1 and 100 bars of oxygen pressure have been analyzed by X-ray diffraction. Results show that the x=0 sample with p=0.09 and superconducting below 20K is orthorhombic at room temperature. The orthorhombic distortion at 300K decreases with increasing x and becomes tetragonal when x reaches 0.08. This orthorhombic-to-tetragonal phase transformation is consistent with previous work. Samples with x≥0.28 and p≥0.31 remain tetragonal but are nonsuperconducting down to 5K. Lattice dimension anomalies have also been observed and are correlated with the sudden appearance of oxygen vacancies, as seen by the hole concentration measurements. Initially, the value of the lattice dimension a decreases and c increases monotonically with increasing x. A sudden increase in a and decrease in c begins when x reaches 0.28 for samples prepared under 1 bar of oxygen indicating a sudden loss of oxygen from the structure. This sudden reversal in lattice dimensions a and c is not present in samples annealed under 100 bars of oxygen pressure suggesting essentially no oxygen vacancies. The increase in c with x of the La2-xSrxCuO4 samples with no oxygen vacancies can be attributed mainly to the result of substituting smaller La+3 ions by larger Sr+2 ions. A study of the variation of c with the hole concentration reveals that the c lattice dimension drops sharply with no change in the hole concentration when oxygen is continuously removed from the lattice caused by an increase of the Sr content in La2-xSrxCuO4.

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High-Tc Superconducting Oxide Solid Solutions (La1−x(Ba,Sr,Ca)x)2CuO4−δ

Cited by 36 publications

References 9 publications

Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

Synthesis, Crystal Structure and Physical Properties of Li Mg0.857−Cu2.143O3−

A Study of the Superconducting La_2-xSr_xCuO₄ System by X-Ray Powder Diffraction

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High-Tc Superconducting Oxide Solid Solutions (La1−x(Ba,Sr,Ca)x)2CuO4−δ

Cited by 36 publications

References 9 publications

Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

Superconductivity of Rock-Salt Structure LaO Epitaxial Thin Film

Synthesis, Crystal Structure and Physical Properties of Li Mg0.857−Cu2.143O3−

A Study of the Superconducting La2-xSrxCuO4 System by X-Ray Powder Diffraction

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A Study of the Superconducting La_2-xSr_xCuO₄ System by X-Ray Powder Diffraction