Magnetic neutron diffraction from the magnetic clusters in single crystal BaCuO{sub 2+x}

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.465· OSTI ID:565886

Vaknin, D ^[1]; Koster, J P ^[2]; Zarestky, J L; Wang, Z R ^[1]; Fernandez-Baca, J A ^[3]; Johnston, D C ^[1]

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1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
2. Department of Physics, University of Florida, Gainesville, Florida 32611 (United States)
3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

Magnetic-neutron-diffraction studies of a single crystal of BaCuO{sub 2+x} confirm the antiferromagnetic structure of the ringlike Cu{sub 6} clusters with ground-state spin S=3 proposed by Wang {ital et al.} [Science {bold 264}, 402 (1994)]. No indication of a spontaneous ferromagnetic (or simple antiferromagnetic) ordering of the spherelike Cu{sub 18} S=9 clusters were observed down to a temperature of 50 mK, in disagreement with the suggestion based on magnetic-susceptibility measurements performed down to 2 K. However, diffraction scans under applied magnetic fields up to 3 T, at temperatures of 0.05 and 4.2 K align the sphere clusters ferromagnetically. The magnetic-field-induced ferromagnetic-diffraction pattern is consistent with the form factor of the Cu{sub 18} spherelike cluster. Frustration in the coupling with nearest neighbors leads to a paramagnetic behavior or a complex magnetic structure (noncollinear and/or incommensurate) of the spherelike clusters, consistent with our findings. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 565886
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
BARIUM OXIDES
COPPER OXIDES
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
ORDER-DISORDER TRANSFORMATIONS
TEMPERATURE RANGE 0000-0013 K