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HRTEM and EELS Study for Superconducting and Non-Superconducting (Cu,Cr)-1212 Cuprates

Published online by Cambridge University Press:  02 July 2020

Y. Anan ,
T. Asaka ,
H. Kurami ,
J. Hatano ,
S. Tsutsumi ,
K. Kimoto  and
Y. Matsui
Y. Anan
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba305-0044, Japan Faculty of Industrial Science and Technology, Science University of Tokyo, Noda278-8510, Japan
T. Asaka
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba305-0044, Japan Graduate School of Science and Engineering, Waseda University, Tokyo169-8085, Japan
H. Kurami
Affiliation:
Graduate School of Science and Engineering, Waseda University, Tokyo169-8085, Japan
J. Hatano
Affiliation:
Faculty of Industrial Science and Technology, Science University of Tokyo, Noda278-8510, Japan
S. Tsutsumi
Affiliation:
Graduate School of Science and Engineering, Waseda University, Tokyo169-8085, Japan
K. Kimoto
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba305-0044, Japan
Y. Matsui
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba305-0044, Japan Faculty of Industrial Science and Technology, Science University of Tokyo, Noda278-8510, Japan
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Abstract

The crystal structures of high temperature superconducting cuprates consist of alternative stacking of charge-reservoir (CR) block and conduction block. in case of YBa2Cu3Oy, (YBCO), CR block contains one-dimensional Cu(I)-O chain and BaO layers, and conduction block contains two-dimensional Cu(II)O2 planes and Y layers. YSr2Cu3Oy (YSCO), where Ba-sites of the YBCO are replaced by Sr completely can be obtained only by high-pressure synthesis. However, by replacing Cu(I) partly by Cr, YSr2Cu3-xCrxOy can be obtained even under ambientpressure conditions. The compound YSr2Cu2.8Cr0.2Oy (x=0.2) is non-superconductive, but, superconductivity is induced by partial replacement of Sr-sites with Ba; the compounds with YSr2-xBaxCu2.8Cr0.2Oy (x≤0.5) is non-superconductive, but the compound with x≥1.0 is superconductive. in order to obtain the structural information about the transition to superconducting phases, the effect of the Ba substitution is investigated by transmission electron microscopy (TEM).In the present study, the compounds with YSr2-xBaxCu2.8Cr0.2Oy (x=0-1.5) are examined by high resolution TEM (HRTEM) and electron energy-loss spectroscopy (EELS) to elucidate structural and electrical modification induced by Ba-substitution.

Type
Novel Microscopy Assisted Ceramic Developments in Materials Scienceand Nanotechnology (Organized by P. Gai and J. Lee)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 402 - 403
Copyright
Copyright © Microscopy Society of America 2001

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