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Title: Hole doping and superconductivity characteristics of the s=1, 2 and 3 members of the (Cu,Mo)-12s2 homologous series of layered copper oxides

Abstract

Superconductivity characteristics have been systematically evaluated for a two-CuO{sub 2}-plane copper oxide system (Cu,Mo)-12s2, upon increasing the number of fluorite-structured layers, s, between the two CuO{sub 2} planes. Essentially single-phase samples of (Cu{sub 0.75}Mo{sub 0.25})Sr{sub 2}YCu{sub 2}O{sub 7+{delta}} (s=1), (Cu{sub 0.75}Mo{sub 0.25})Sr{sub 2}(Ce{sub 0.45}Y{sub 0.55}){sub 2}Cu{sub 2}O{sub 9+{delta}} (s=2) and (Cu{sub 0.75}Mo{sub 0.25})Sr{sub 2}(Ce{sub 0.67}Y{sub 0.33}){sub 3}Cu{sub 2}O{sub 11+{delta}} (s=3) were synthesized through a conventional solid-state route in air. To make the samples superconductive an additional high-pressure oxygenation (HPO) treatment was required. Such treatment (carried out at 5GPa and 500 deg. C in the presence of 75mol% Ag{sub 2}O{sub 2} as an oxygen source to maximize the T{sub c}) compressed the crystal lattice for the three members of the (Cu{sub 0.75}Mo{sub 0.25})-12s2 series equally, i.e., by 0.01A for the a parameter and by 0.07A for the c parameter per formula unit. From both Cu L-edge and O K-edge XANES spectra the s=1 sample was found to possess the highest overall hole-doping level among the HPO samples. Accordingly it exhibited the best superconductivity characteristics. With increasing s, both the T{sub c} (s=1: 88K, s=2: 61K, s=3: 53K) and H{sub irr} values got depressed, being well explained by the trend of decreasingmore » CuO{sub 2}-plane hole concentration with increasing s as revealed from O K-edge XANES spectra for the same samples. Hence, the present results do not suggest any significant (negative) impact on the superconductivity characteristics from the gradually thickened fluorite-structured block itself.« less

Authors:
 [1];  [2];  [2];  [2];  [3];  [4];  [2]
  1. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan). E-mail: karppinen@msl.titech.ac.jp
  2. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan)
  3. National Synchrotron Radiation Research Center (NSRRC), Hsinchu, Taiwan (China)
  4. Department of Chemistry, National Taiwan University, Taipei, Taiwan (China)
Publication Date:
OSTI Identifier:
20784785
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 178; Journal Issue: 11; Other Information: DOI: 10.1016/j.jssc.2005.08.029; PII: S0022-4596(05)00385-3; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; COPPER OXIDES; CRYSTAL LATTICES; FLUORITE; LAYERS; SPECTRA; SUPERCONDUCTIVITY; X-RAY SPECTROSCOPY

Citation Formats

Karppinen, M., Morita, Y., Kobayashi, T., Grigoraviciute, I., Chen, J.M., Liu, R.S., and Yamauchi, H.. Hole doping and superconductivity characteristics of the s=1, 2 and 3 members of the (Cu,Mo)-12s2 homologous series of layered copper oxides. United States: N. p., 2005. Web. doi:10.1016/j.jssc.2005.08.029.
Karppinen, M., Morita, Y., Kobayashi, T., Grigoraviciute, I., Chen, J.M., Liu, R.S., & Yamauchi, H.. Hole doping and superconductivity characteristics of the s=1, 2 and 3 members of the (Cu,Mo)-12s2 homologous series of layered copper oxides. United States. doi:10.1016/j.jssc.2005.08.029.
Karppinen, M., Morita, Y., Kobayashi, T., Grigoraviciute, I., Chen, J.M., Liu, R.S., and Yamauchi, H.. Tue . "Hole doping and superconductivity characteristics of the s=1, 2 and 3 members of the (Cu,Mo)-12s2 homologous series of layered copper oxides". United States. doi:10.1016/j.jssc.2005.08.029.
@article{osti_20784785,
title = {Hole doping and superconductivity characteristics of the s=1, 2 and 3 members of the (Cu,Mo)-12s2 homologous series of layered copper oxides},
author = {Karppinen, M. and Morita, Y. and Kobayashi, T. and Grigoraviciute, I. and Chen, J.M. and Liu, R.S. and Yamauchi, H.},
abstractNote = {Superconductivity characteristics have been systematically evaluated for a two-CuO{sub 2}-plane copper oxide system (Cu,Mo)-12s2, upon increasing the number of fluorite-structured layers, s, between the two CuO{sub 2} planes. Essentially single-phase samples of (Cu{sub 0.75}Mo{sub 0.25})Sr{sub 2}YCu{sub 2}O{sub 7+{delta}} (s=1), (Cu{sub 0.75}Mo{sub 0.25})Sr{sub 2}(Ce{sub 0.45}Y{sub 0.55}){sub 2}Cu{sub 2}O{sub 9+{delta}} (s=2) and (Cu{sub 0.75}Mo{sub 0.25})Sr{sub 2}(Ce{sub 0.67}Y{sub 0.33}){sub 3}Cu{sub 2}O{sub 11+{delta}} (s=3) were synthesized through a conventional solid-state route in air. To make the samples superconductive an additional high-pressure oxygenation (HPO) treatment was required. Such treatment (carried out at 5GPa and 500 deg. C in the presence of 75mol% Ag{sub 2}O{sub 2} as an oxygen source to maximize the T{sub c}) compressed the crystal lattice for the three members of the (Cu{sub 0.75}Mo{sub 0.25})-12s2 series equally, i.e., by 0.01A for the a parameter and by 0.07A for the c parameter per formula unit. From both Cu L-edge and O K-edge XANES spectra the s=1 sample was found to possess the highest overall hole-doping level among the HPO samples. Accordingly it exhibited the best superconductivity characteristics. With increasing s, both the T{sub c} (s=1: 88K, s=2: 61K, s=3: 53K) and H{sub irr} values got depressed, being well explained by the trend of decreasing CuO{sub 2}-plane hole concentration with increasing s as revealed from O K-edge XANES spectra for the same samples. Hence, the present results do not suggest any significant (negative) impact on the superconductivity characteristics from the gradually thickened fluorite-structured block itself.},
doi = {10.1016/j.jssc.2005.08.029},
journal = {Journal of Solid State Chemistry},
number = 11,
volume = 178,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2005},
month = {Tue Nov 15 00:00:00 EST 2005}
}