Journal ArticleDOI
Structure and superconductivity of the infinite-layer compound (Ca1−ySry)1−xCuO2−z
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In this paper, the structure and superconducting properties of the infinite-layer compound A 1− x CuO 2− z (A=Ca 1− y Sr y ) have been investigated by high-resolution electron microscopy as well as magnetization and resistivity measurements.Abstract:
Microstructure and superconducting properties of the infinite-layer compound A 1− x CuO 2− z (A=Ca 1− y Sr y ) have been investigated by high-resolution electron microscopy as well as magnetization and resistivity measurements. The alkaline earth deficient samples always contain defect-layers inserted almost randomly into the parent simple structure, where we suggest that the A cation vacancies are concentrated. High-resolution electron microscopy observations reveal that oxygen deficiency can simultaneously occur within the central CuO 2 sheet of the defect layer for the sake of charge compensation for the A deficiency. p-type superconductivity with a maximum T c of 110 K is realized if the oxygen defects are filled in by application of high oxygen pressure on high-pressure synthesis ( z ∼0). On the other hand, n-type superconductivity also occurs in the same structure when oxygen deficency is increased so that z > x by a heat-treatment in a reducing atmosphere under high pressure. The fundamental relationship between structure and superconductivity is discussed on the basis of the demonstrated structural uniqueness of the title compound.read more
Citations
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A new family of copper oxide superconductors Srn+1CunO2n+1+δ stabilized at high pressure
TL;DR: In this paper, a new family of high-pressure phases with the formula Srn+1CunO2N+1+δ (n = 1, 2, 3,...) extending from Sr2CuO3.1.
Journal ArticleDOI
Structures of High‐Temperature Cuprate Superconductors
Chan Park,Robert L. Snyder +1 more
TL;DR: Most of the known cuprate superconductors are shown to belong structurally to a single family and are closely related to each other as discussed by the authors, which leads to three significant insights into the nature of, and requirements for, superconductivity in these phases: (1) a nearly planar sheet of CuO{sub 2} supports the supercurrent; (2) as the distance between the n ACuO{ sub 2} blocks in a crystal structure increases, the critical current density decreases at high reduced temperatures due to the magnetic flux lines becoming unpinned; (
Journal ArticleDOI
Superconductivity in CaCuO2 as a result of field-effect doping.
Jan Hendrik Schön,M. Dorget,M. Dorget,F. C. Beuran,X. Z. Zu,E. Arushanov,E. Arushanov,C. Deville Cavellin,C. Deville Cavellin,Michel Laguës +9 more
TL;DR: The transport properties of thin films of the infinite-layer compound CaCuO2 using field-effect doping is reported, showing that at high hole- and electron-doping levels, superconductivity is induced in the nominally insulating material.
Journal ArticleDOI
Application of high-pressure techniques: stabilization and oxidation-state control of novel superconductive and related multi-layered copper oxides
TL;DR: In this paper, the potential and applications of high pressure techniques in synthesizing multi-layered copper oxides and related structures are reviewed and discussed with emphasis on the important historical discoveries of novel phases and the present status of controlled production of high-quality samples of such phases.
Journal ArticleDOI
Evidence suggesting superconductivity at 250 k in a sequentially deposited cuprate film.
Michel Laguës,Xiao Ming Xie,Hassan Tebbji,Xiang Zhen Xu,Vincent Mairet,Christophe Hatterer,C. F. Beuran,Catherine Deville-Cavellin +7 more
TL;DR: An artificial cuprate compound belonging to the BiSrCaCuO family with eight adjacent sequetially imposed layer epitaxy that exhibits a diamagnetic variation of susceptibility and magnetization below 290 kelvin is presented.
References
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Journal ArticleDOI
Structural anomalies, oxygen ordering and superconductivity in oxygen deficient Ba2YCu3Ox
Robert J. Cava,A.W. Hewat,Elizabeth A. Hewat,Bertram Batlogg,M. Marezio,M. Marezio,Karin M. Rabe,J. J. Krajewski,W. F. Peck,L. W. Rupp +9 more
TL;DR: In this article, the authors report the characterization of series of oxygen deficient Ba2YCu3Ox samples for 7 ≥ x ≥ 6 prepared by Zr gettered annealing at 440°C.
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The parent structure of the layered high-temperature superconductors
TL;DR: In this article, the authors reported the growth of small single crystals of this phase, with composition (Ca 0.86Sr0.14)CuO2, and their characterization by single-crystal X-ray diffraction.
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Electron-doped superconductivity at 40 K in the infinite-layer compound Sr1–yNdyCu02
TL;DR: In this paper, the isostructural compound Sr1-yNdyCuO2, in which the substitution of neodymium for strontium adds electrons to the CuO2 planes, is superconducting at 40 K.
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Superconductivity at 110 K in the infinite-layer compound (Sr1-xCax)1-yCuO2
TL;DR: In this article, the authors reported the isolation of an alkaline-earth-deficient infinite-layer phase, (Ca1-xSrx)1-yCuO2 (y~Ol), with Tc up to 110 K.
Journal ArticleDOI
A new homologous series Srn−1Cun+1O2n found in the SrOCuO system treated under high pressure
TL;DR: In this article, a homologous series of high pressure phases, Srn−1Cun+1O2n (n = 3, 5, …), were found in the SrOCuO system treated at 6 GPa and 1373-1573 K. These crystallize in orthorhombic structures of space group Cmmm with unit-cell parameters of a ∼ 3.9 A.