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Title: Comparison of paramagnetic- and nonmagnetic-impurity effects on superconductivity in Nd sub 1. 85 Ce sub 0. 15 CuO sub 4

Abstract

The effects of substitution of Co, Ni, or Zn for Cu in the electron-doped superconductors, Nd{sub 1.85}Ce{sub 0.15}Cu{sub 1{minus}{ital x}M{ital x}}O{sub 4} (with {ital M}=Co, Ni, or Zn, {ital x}{le}0.05), have been investigated by powder x-ray diffraction analysis and resistivity, magnetic-susceptibility, and Hall-coefficient measurements. It is observed that only 0.7% Co or 0.8% Ni substitution for Cu destroys superconductivity. On the contrary, for the Zn-substituted samples, it is observed that {ital T}{sub {ital c}} decreases proportionally to {ital x} and the magnitude of {ital T}{sub {ital c}} is {similar to}9 K even for the 2% Zn-substituted sample. This result suggests that the pair-breaking effect plays a dominant role in the suppression of superconductivity in the Co- or Ni-substitute samples. The absolute values of the exchange-interaction energy between an electron and a Co ion and of that between an electron and a Ni ion are estimated at {similar to}0.09 and {similar to}0.08 eV, respectively. These values are comparable to those of the conventional BCS-type superconductors containing paramagnetic impurities. Both the absolute value of the Hall coefficient ({vert bar}{ital R}{sub {ital H}}{vert bar}) and its temperature coefficient ({ital d}{vert bar}{ital R}{sub {ital H}}{vert bar}/{ital dT}) are found to decrease as {ital x}more » increases for all the samples at temperatures higher than 120 K. However, for the Co-substituted samples, it is clearly observed that {vert bar}{ital R}{sub {ital H}}{vert bar} increases proportionally to {ital x} at 30 K, while {vert bar}{ital R}{sub {ital H}}{vert bar} decreases monotonically with increasing {ital x} for the Ni- or Zn-substitute samples. Therefore, it seems that there are no clear relations between the temperature dependence of {ital R}{sub {ital H}} and the suppression in the magnitude of {ital T}{sub {ital c}} due to the substitutional effects.« less

Authors:
; ; ; ;  [1]
  1. Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, Japan (JP)
Publication Date:
OSTI Identifier:
5692206
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (USA)
Additional Journal Information:
Journal Volume: 43:13; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM OXIDES; SUPERCONDUCTIVITY; COPPER OXIDES; NEODYMIUM OXIDES; COBALT ADDITIONS; EXCHANGE INTERACTIONS; HALL EFFECT; MAGNETIC SUSCEPTIBILITY; NICKEL ADDITIONS; QUANTITY RATIO; TRANSITION TEMPERATURE; X-RAY DIFFRACTION; ZINC ADDITIONS; ALLOYS; CERIUM COMPOUNDS; CHALCOGENIDES; COBALT ALLOYS; COHERENT SCATTERING; COPPER COMPOUNDS; DIFFRACTION; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; INTERACTIONS; MAGNETIC PROPERTIES; NEODYMIUM COMPOUNDS; NICKEL ALLOYS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; ZINC ALLOYS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Sugiyama, J, Tokuono, S, Koriyama, S, Yamauchi, H, and Tanaka, S. Comparison of paramagnetic- and nonmagnetic-impurity effects on superconductivity in Nd sub 1. 85 Ce sub 0. 15 CuO sub 4. United States: N. p., 1991. Web. doi:10.1103/PhysRevB.43.10489.
Sugiyama, J, Tokuono, S, Koriyama, S, Yamauchi, H, & Tanaka, S. Comparison of paramagnetic- and nonmagnetic-impurity effects on superconductivity in Nd sub 1. 85 Ce sub 0. 15 CuO sub 4. United States. https://doi.org/10.1103/PhysRevB.43.10489
Sugiyama, J, Tokuono, S, Koriyama, S, Yamauchi, H, and Tanaka, S. 1991. "Comparison of paramagnetic- and nonmagnetic-impurity effects on superconductivity in Nd sub 1. 85 Ce sub 0. 15 CuO sub 4". United States. https://doi.org/10.1103/PhysRevB.43.10489.
@article{osti_5692206,
title = {Comparison of paramagnetic- and nonmagnetic-impurity effects on superconductivity in Nd sub 1. 85 Ce sub 0. 15 CuO sub 4},
author = {Sugiyama, J and Tokuono, S and Koriyama, S and Yamauchi, H and Tanaka, S},
abstractNote = {The effects of substitution of Co, Ni, or Zn for Cu in the electron-doped superconductors, Nd{sub 1.85}Ce{sub 0.15}Cu{sub 1{minus}{ital x}M{ital x}}O{sub 4} (with {ital M}=Co, Ni, or Zn, {ital x}{le}0.05), have been investigated by powder x-ray diffraction analysis and resistivity, magnetic-susceptibility, and Hall-coefficient measurements. It is observed that only 0.7% Co or 0.8% Ni substitution for Cu destroys superconductivity. On the contrary, for the Zn-substituted samples, it is observed that {ital T}{sub {ital c}} decreases proportionally to {ital x} and the magnitude of {ital T}{sub {ital c}} is {similar to}9 K even for the 2% Zn-substituted sample. This result suggests that the pair-breaking effect plays a dominant role in the suppression of superconductivity in the Co- or Ni-substitute samples. The absolute values of the exchange-interaction energy between an electron and a Co ion and of that between an electron and a Ni ion are estimated at {similar to}0.09 and {similar to}0.08 eV, respectively. These values are comparable to those of the conventional BCS-type superconductors containing paramagnetic impurities. Both the absolute value of the Hall coefficient ({vert bar}{ital R}{sub {ital H}}{vert bar}) and its temperature coefficient ({ital d}{vert bar}{ital R}{sub {ital H}}{vert bar}/{ital dT}) are found to decrease as {ital x} increases for all the samples at temperatures higher than 120 K. However, for the Co-substituted samples, it is clearly observed that {vert bar}{ital R}{sub {ital H}}{vert bar} increases proportionally to {ital x} at 30 K, while {vert bar}{ital R}{sub {ital H}}{vert bar} decreases monotonically with increasing {ital x} for the Ni- or Zn-substitute samples. Therefore, it seems that there are no clear relations between the temperature dependence of {ital R}{sub {ital H}} and the suppression in the magnitude of {ital T}{sub {ital c}} due to the substitutional effects.},
doi = {10.1103/PhysRevB.43.10489},
url = {https://www.osti.gov/biblio/5692206}, journal = {Physical Review, B: Condensed Matter; (USA)},
issn = {0163-1829},
number = ,
volume = 43:13,
place = {United States},
year = {Wed May 01 00:00:00 EDT 1991},
month = {Wed May 01 00:00:00 EDT 1991}
}