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Title: Superconductivity in Y{sub 0.6}Pr{sub 0.4}Ba{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}}: The role of apical oxygen in hybridization

Abstract

The structural and electric properties of Y{sub 0.6}Pr{sub 0.4}Ba{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}} have been investigated as a function of {ital x}. X-ray powder-diffraction patterns indicate that a solid solution forms with {ital x} extending to about 1.4. It is found that the substitution of Sr for Ba results in a contraction in the {ital c} axis at the same rate as in YBa{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}}. The oxygen content and {ital T}{sub {ital c}} are found to remain essentially unchanged with increasing Sr. Our analysis suggests that the contraction in {ital c} arises mainly from the shift of the apical oxygen and from a shift of Ba(Sr) towards the CuO{sub 2} planes. The apparent shift of the apical oxygen does not seem to influence the hybridization between the Pr 4{ital f} electrons and the valence band of the CuO{sub 2} planes significantly. The hybridization is more sensitive to the bond length between the Pr and the oxygen located in the CuO{sub 2} planes. {ital T}{sub {ital c}} in this system appears to be controlled both by the shift of the apical oxygen and by the hybridization.

Authors:
 [1];  [1];  [2];  [3];  [1]
  1. Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China)
  2. Department of Physics, Beijing Normal University, Beijing 100875 (China)
  3. National Laboratory for Superconductivity, Beijing 100080 (China)
Publication Date:
OSTI Identifier:
55097
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 51; Journal Issue: 22; Other Information: PBD: 1 Jun 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HIGH-TC SUPERCONDUCTORS; TRANSITION TEMPERATURE; COPPER OXIDES; BARIUM OXIDES; STRONTIUM OXIDES; PRASEODYMIUM OXIDES; YTTRIUM OXIDES; OXYGEN; HYBRIDIZATION; LATTICE PARAMETERS

Citation Formats

Chen, X, Liang, J, International Center for Materials Physics, Academia Sinica, Shenyang 110015, Wang, Y, Wu, F, and Rao, G. Superconductivity in Y{sub 0.6}Pr{sub 0.4}Ba{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}}: The role of apical oxygen in hybridization. United States: N. p., 1995. Web. doi:10.1103/PhysRevB.51.16444.
Chen, X, Liang, J, International Center for Materials Physics, Academia Sinica, Shenyang 110015, Wang, Y, Wu, F, & Rao, G. Superconductivity in Y{sub 0.6}Pr{sub 0.4}Ba{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}}: The role of apical oxygen in hybridization. United States. https://doi.org/10.1103/PhysRevB.51.16444
Chen, X, Liang, J, International Center for Materials Physics, Academia Sinica, Shenyang 110015, Wang, Y, Wu, F, and Rao, G. 1995. "Superconductivity in Y{sub 0.6}Pr{sub 0.4}Ba{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}}: The role of apical oxygen in hybridization". United States. https://doi.org/10.1103/PhysRevB.51.16444.
@article{osti_55097,
title = {Superconductivity in Y{sub 0.6}Pr{sub 0.4}Ba{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}}: The role of apical oxygen in hybridization},
author = {Chen, X and Liang, J and International Center for Materials Physics, Academia Sinica, Shenyang 110015 and Wang, Y and Wu, F and Rao, G},
abstractNote = {The structural and electric properties of Y{sub 0.6}Pr{sub 0.4}Ba{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}} have been investigated as a function of {ital x}. X-ray powder-diffraction patterns indicate that a solid solution forms with {ital x} extending to about 1.4. It is found that the substitution of Sr for Ba results in a contraction in the {ital c} axis at the same rate as in YBa{sub 2{minus}{ital x}}Sr{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}}. The oxygen content and {ital T}{sub {ital c}} are found to remain essentially unchanged with increasing Sr. Our analysis suggests that the contraction in {ital c} arises mainly from the shift of the apical oxygen and from a shift of Ba(Sr) towards the CuO{sub 2} planes. The apparent shift of the apical oxygen does not seem to influence the hybridization between the Pr 4{ital f} electrons and the valence band of the CuO{sub 2} planes significantly. The hybridization is more sensitive to the bond length between the Pr and the oxygen located in the CuO{sub 2} planes. {ital T}{sub {ital c}} in this system appears to be controlled both by the shift of the apical oxygen and by the hybridization.},
doi = {10.1103/PhysRevB.51.16444},
url = {https://www.osti.gov/biblio/55097}, journal = {Physical Review, B: Condensed Matter},
number = 22,
volume = 51,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 1995},
month = {Thu Jun 01 00:00:00 EDT 1995}
}