Superconductivity and magnetic order in (Pr{sub 0.55}Nd{sub 0.45})Ba{sub 2}Cu{sub 3}O{sub 7}

Journal Article · Mon Mar 31 23:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365132· OSTI ID:496456

Li, W; Lee, K C ^[1]; Ku, H C ^[2]

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1. Department of Physics, National Central University, Chung-li, Taiwan 32054, Republic of (China)
2. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300, Republic of (China)

Crystal structure, superconductivity, and magnetic order of the Pr spins in polycrystalline (Pr{sub 0.55}Nd{sub 0.45})Ba{sub 2}Cu{sub 3}O{sub 7} were studied by x ray and ac susceptibility measurements. The crystal structure was determined by applying the Rietveld refinement method to the high resolution x-ray diffraction pattern. The Pr and Nd atoms are randomly mixed to form (Pr{sub 0.55}Nd{sub 0.45}) layers rather than two separated PrBa{sub 2}Cu{sub 3}O{sub 7} and NdBa{sub 2}Cu{sub 3}O{sub 7} phases. Above 50 K the temperature dependence of the in-phase component of the ac susceptibility {chi}{sup {prime}}(T) exhibits Curie{endash}Weiss behavior. Below 50 K diamagnetic responses become evident, indicating the onset of superconductivity. A dc field of strength 2 kOe smears out 80{percent} of the diamagnetic signals, showing the superconducting pairings are being destroyed by the applied field. Further reducing the temperature, {chi}{sup {prime}}(T) shows an upturn at T{approx}15 K below which {chi}{sup {prime}}(T) increases rapidly with decreasing temperature, presumably due to the Pr spin ordering. Both the onset of superconductivity and the spin ordering of the Pr ions are also evident in the temperature dependence of the out-of-phase component of the ac susceptibility {chi}{sup {prime}{prime}}(T). {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496456
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
CRYSTAL STRUCTURE
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
POLYCRYSTALS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION