title: Spin fluctuations of paramagnetic Rh clusters revealed by x-ray magnetic circular dichroism.
abstract: The magnetic moment induced on Rh atoms, forming 1.6 nm average diameter clusters, embedded in an Al(2)O(3) matrix, has been determined using x-ray magnetic circular dichroism measurements. The magnetic moment varies linearly with the applied magnetic field. At 2.3 K and under 17 T, the spin magnetic moment amounts to 0.067(2) μ(B)/Rh atom. The orbital moment does not exceed 2% of the spin moment. The susceptibility is highly temperature dependent. This is in agreement with a prediction due to Moriya and Kawabata, that in itinerant electron systems, close to the onset of magnetism, the renormalization of the magnetic susceptibility by electron correlations, leads to a Curie-like behavior.
authors.affiliation: Instituto de Física, Universidade Federal do Rio de Janeiro, 21941-972 Rio de Janeiro, Brazil.
authors.forename: V M T S
authors.initials: VM
authors.lastname: Barthem
authors.forename: A
authors.initials: A
authors.lastname: Rogalev
authors.forename: F
authors.initials: F
authors.lastname: Wilhelm
authors.forename: M M
authors.initials: MM
authors.lastname: Sant'anna
authors.forename: S L A
authors.initials: SL
authors.lastname: Mello
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: P
authors.initials: P
authors.lastname: Bayle-Guillemaud
authors.forename: D
authors.initials: D
authors.lastname: Givord
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D002942:Circular Dichroism / Q000379:methods*; D004574:Electromagnetic Fields; D012238:Rhodium / Q000737:chemistry*
chemical_list: D012238:Rhodium; D000537:Aluminum Oxide