Oxygen dependence of the magnetic order of Nd in NdBa[sub 2]Cu[sub 3]O[sub 6+[ital x]]

Journal Article · Sat May 15 04:00:00 EDT 1993 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.352633· OSTI ID:6891449

Clinton, T W; Lynn, J W ^[1]; Lee, B W; Buchgeister, M; Maple, M B ^[2]

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1. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States) Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
2. Department of Physics and California-San Diego, La Jolla, California 92093 (United States)

Neutron scattering and specific heat measurements have been carried out on a series of NdBa[sub 2]Cu[sub 3]O[sub 6+[ital x]] powder samples with varying oxygen concentrations ([ital x]=0.94, 0.78, 0.45, 0.3, 0.13) in order to study the effects of oxygen on the magnetic order of Nd. For our highest oxygenated superconducting NdBa[sub 2]Cu[sub 3]O[sub 6.94] ([ital T][sub [ital c]][congruent]92 K), three-dimensional (3D) long range order develops below [ital T][sub [ital N]][congruent]0.53 K, with a spin configuration which is antiferromagnetic along all three crystallographic axes. For a small reduction of oxygen to [ital x]=0.78, we observe drastic effects on the Nd order; 3D order is inhibited and only short range 2D correlations are found at low temperature. However, the 2D correlations develop at a much higher temperature, near 1.5 K. At (nonsuperconducting) [ital x]=0.45, the 3D magnetic order is better developed at low temperature, yet long range order still does not occur. For [ital x]=0.3, 3D long range magnetic order of the Nd ions is reestablished, developing below [ital T][sub [ital N]][congruent]1.5 K, three times that of the fully oxygenated material. All of these ordering temperatures are much higher than what is expected based on dipolar interactions alone, and this coupled with our experimental results indicates that exchange interactions play an essential role, and are strongly influenced by the chain layer oxygen.

• DOE Contract Number: FG03-86ER45230
• OSTI ID: 6891449
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 73:10; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELEMENTS
EXCHANGE INTERACTIONS
HIGH-TC SUPERCONDUCTORS
INTERACTIONS
MAGNETIC PROPERTIES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NEUTRON DIFFRACTION
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SPECIFIC HEAT
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS