Effects of oxygen on the magnetic order of the rare-earth ions in {ital R}Ba{sub 2}Cu{sub 3}O{sub 6+{ital x}} ({ital R}=Dy, Er, Nd)
- Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
- Department of Physics, University of California, Davis, California 95616 (United States)
- Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California 92093 (United States)
In addition, for a concentration 0.54{le}{ital x}{sub {ital c}}{lt}1, still in the superconducting phase, the spin configuration changes along the {ital c}-axis to ferromagnetic. In the insulating phase, {ital x}{approx_lt}0.4, we observe {ital both} 2D and 3D diffuse scattering developing below 2 K, but 3D long-range order never occurs. In our highest oxygenated NdBa{sub 2}Cu{sub 3}O{sub 6.94} ({ital T}{sub {ital c}}{congruent}92 K), 3D long-range order develops below {ital T}{sub {ital N}}{congruent}0.53 K. For a small reduction of oxygen to {ital x}=0.78, we observe drastic effects on the Nd order as {ital only} short-range 2D correlations are found at low temperatures. At nonsuperconducting {ital x}=0.45, 3D correlations develop at low temperatures, yet long-range order still does not occur. For {ital x}=0.3, 3D long-range order is reestablished, developing below {ital T}{sub {ital N}}{congruent}1.5 K, three times that of the fully oxygenated material. Though the oxygen dependence of the rare-earth magnetism varies between the three compounds we have studied, our results indicate there is significant coupling between the chain layer oxygen and the rare-earth ions in each case.
- DOE Contract Number:
- FG03-86ER45230
- OSTI ID:
- 54947
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 51; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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