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Title: Magnetic order and superconductivity in RBa/sub 2/Cu/sub 3/O/sub z/

Abstract

Moessbauer studies of /sup 57/Fe in RBa/sub 2-//sub y/K/sub y/(Cu/sub 1-//sub x/Fe/sub x/)/sub 3/O/sub z/, with R = Y and Pr, y = 0 and 0.5, x = 0.01, 0.05, and 0.1, z between 5.9 and 7.1, have been performed. A minority of the iron ions enter the Cu(2) site and reveal its magnetic order. For R = Y, y = 0, and x = 0.1, T/sub N/ equals 280 and 415 K for z = 6.5 and 6.1, respectively. The magnetic moments lie in the basal plane. In tetragonal, oxygen-rich PrBa/sub 2/(Cu/sub 0.9/Fe/sub 0.1/)/sub 3/O/sub 6.9/, T/sub N/ = 325 K; in superconducting YBa/sub 2/(Cu/sub 0.9/Fe/sub 0.1/)/sub 3/O/sub 7.1/ there is no magnetic order. In nonsuperconducting YBa/sub 1.5/K/sub 0.5/(Cu/sub 0.95/Fe/sub 0.05/)/sub 3/O/sub 6.1/ two distinctly inequivalent magnetic iron sites are observed, corresponding to iron in the Cu(2) site with different Ba-K neighbors. Moments of iron ions that have three Ba and one K as first nearest neighbors have a different temperature dependence and T/sub N/ (T/sub N/ = 450 K) from those with four Ba neighbors, where T/sub N/ = 415 K, showing that the antiferromagnetic exchange in the Cu(2) planes is strongly affected by the replacement of Ba/supmore » 2+/ by K/sup +/, probably by repelling oxygen from the Cu(2) plane. In superconducting YBa/sub 1.5/K/sub 0.5/(Cu/sub 0.95/Fe/sub 0.05/)/sub 3/O/sub 6.5/ the iron site with T/sub N/ = 450 K remains magnetic. The implications of these findings on the valencies of the Cu ions are discussed.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Racah Institute of Physics, The Hebrew University, 91chemically bond904 Jerusalem, Israel
OSTI Identifier:
6933767
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B: Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 38:10
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; MOESSBAUER EFFECT; SUPERCONDUCTIVITY; COPPER OXIDES; IRON OXIDES; POTASSIUM OXIDES; PRASEODYMIUM OXIDES; YTTRIUM OXIDES; HIGH TEMPERATURE; IRON 57; LOW TEMPERATURE; MAGNETIC MOMENTS; MEDIUM TEMPERATURE; TEMPERATURE DEPENDENCE; ULTRALOW TEMPERATURE; VALENCE; VERY LOW TEMPERATURE; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; EVEN-ODD NUCLEI; INTERMEDIATE MASS NUCLEI; IRON COMPOUNDS; IRON ISOTOPES; ISOTOPES; NUCLEI; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; POTASSIUM COMPOUNDS; PRASEODYMIUM COMPOUNDS; RARE EARTH COMPOUNDS; STABLE ISOTOPES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Nowik, I, Kowitt, M, Felner, I, and Bauminger, E R. Magnetic order and superconductivity in RBa/sub 2/Cu/sub 3/O/sub z/. United States: N. p., 1988. Web. doi:10.1103/PhysRevB.38.6677.
Nowik, I, Kowitt, M, Felner, I, & Bauminger, E R. Magnetic order and superconductivity in RBa/sub 2/Cu/sub 3/O/sub z/. United States. https://doi.org/10.1103/PhysRevB.38.6677
Nowik, I, Kowitt, M, Felner, I, and Bauminger, E R. 1988. "Magnetic order and superconductivity in RBa/sub 2/Cu/sub 3/O/sub z/". United States. https://doi.org/10.1103/PhysRevB.38.6677.
@article{osti_6933767,
title = {Magnetic order and superconductivity in RBa/sub 2/Cu/sub 3/O/sub z/},
author = {Nowik, I and Kowitt, M and Felner, I and Bauminger, E R},
abstractNote = {Moessbauer studies of /sup 57/Fe in RBa/sub 2-//sub y/K/sub y/(Cu/sub 1-//sub x/Fe/sub x/)/sub 3/O/sub z/, with R = Y and Pr, y = 0 and 0.5, x = 0.01, 0.05, and 0.1, z between 5.9 and 7.1, have been performed. A minority of the iron ions enter the Cu(2) site and reveal its magnetic order. For R = Y, y = 0, and x = 0.1, T/sub N/ equals 280 and 415 K for z = 6.5 and 6.1, respectively. The magnetic moments lie in the basal plane. In tetragonal, oxygen-rich PrBa/sub 2/(Cu/sub 0.9/Fe/sub 0.1/)/sub 3/O/sub 6.9/, T/sub N/ = 325 K; in superconducting YBa/sub 2/(Cu/sub 0.9/Fe/sub 0.1/)/sub 3/O/sub 7.1/ there is no magnetic order. In nonsuperconducting YBa/sub 1.5/K/sub 0.5/(Cu/sub 0.95/Fe/sub 0.05/)/sub 3/O/sub 6.1/ two distinctly inequivalent magnetic iron sites are observed, corresponding to iron in the Cu(2) site with different Ba-K neighbors. Moments of iron ions that have three Ba and one K as first nearest neighbors have a different temperature dependence and T/sub N/ (T/sub N/ = 450 K) from those with four Ba neighbors, where T/sub N/ = 415 K, showing that the antiferromagnetic exchange in the Cu(2) planes is strongly affected by the replacement of Ba/sup 2+/ by K/sup +/, probably by repelling oxygen from the Cu(2) plane. In superconducting YBa/sub 1.5/K/sub 0.5/(Cu/sub 0.95/Fe/sub 0.05/)/sub 3/O/sub 6.5/ the iron site with T/sub N/ = 450 K remains magnetic. The implications of these findings on the valencies of the Cu ions are discussed.},
doi = {10.1103/PhysRevB.38.6677},
url = {https://www.osti.gov/biblio/6933767}, journal = {Phys. Rev. B: Condens. Matter; (United States)},
number = ,
volume = 38:10,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 1988},
month = {Sat Oct 01 00:00:00 EDT 1988}
}