Magnetic neutron diffraction from the magnetic clusters in single crystal BaCuO{sub 2+x}
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
- Department of Physics, University of Florida, Gainesville, Florida 32611 (United States)
- 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
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