Antiferromagnetic ordering and paramagnetic behavior of ferromagnetic Cu[sub 6] and Cu[sub 18] clusters in BaCuO[sub 2+x]
- Iowa State Univ., Ames, IA (United States)
- Oak Ridge National Laboratory, TN (United States)
Magnetization and neutron diffraction measurements of polycrystalline BaCuO[sub 2+x] revealed a combination of magnetic behaviors. The Cu[sub 6] ring clusters and Cu[sub 18] sphere clusters in this compound had ferromagnetic ground states with large spins 3 and 9, respectively. The Cu[sub 6] rings ordered antiferromagnetically below the Neel temperature T[sub N] = 15 [+-] 0.5 kelvin, whereas the Cu[sub 18] spheres remained paramagnetic down to 2 kelvin. The ordered moment below T[sub N] was 0.89(5) Bohr magnetons per Cu in the Cu[sub 6] rings, demonstrating the quantum fluctuation effects are small in these atomic clusters. The Cu[sub 18] clusters are predicted to exhibit ferromagnetic intercluster order below about 1 kelvin.
- OSTI ID:
- 7103832
- Journal Information:
- Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 264:5157; ISSN SCIEAS; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
Similar Records
Neutron diffraction study of the magnetic ordering of BaCuO{sub 2+x}
Neutron diffraction study of the magnetic ordering of BaCuO[sub 2+[ital x]] (abstract)
Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
ATOMIC CLUSTERS
BARIUM COMPOUNDS
COPPER COMPOUNDS
CUPRATES
MAGNETIC PROPERTIES
MAGNETISM
OXYGEN COMPOUNDS
PARAMAGNETISM
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS