Magnetic properties of neptunium Laves phases: High-field measurements on NpAl/sub 2/ and NpOs/sub 2/

Journal Article · Sun Aug 01 00:00:00 EDT 1976 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.14.1276· OSTI ID:7267439

Aldred, A T; Dunlap, B D; Lander, G H

The magnetic properties of the cubic C-15-type Laves phases NpAl/sub 2/ and NpOs/sub 2/ have been studied in fields up to 80 kOe by means of bulk magnetization, nuclear ..gamma..-ray resonance (NGR), and neutron-diffraction techniques. Both materials are ferromagnetic. In NpAl/sub 2/, the bulk moment mu-bar/sub 0/ = 1.21..mu../subB/, whereas the 5f moment, as determined by NGR and neutron-diffraction methods, is 1.50..mu../subB/. NpAl/sub 2/ is a localized ferromagnet with a small high-field susceptibility and, in common with all other actinide ferromagnets examined so far, exhibits a negative conduction-electron polarization. In contrast, NpOs/sub 2/ behaves like an itinerant ferromagnet with a large high-field susceptibility, and a total moment mu-bar/sub 0/ = 0.44..mu../subB/. If the NGR and neutron-diffraction measurements are interpreted in terms of localized 5f moments, they give values for the Np moment in NpOs/sub 2/ of 0.40..mu../subB/ and 0.25..mu../subB/, respectively. A qualitative discussion is presented to argue that the 5f electrons in NpOs/sub 2/ are spatially delocalized and that this will reconcile the discrepancies between the magnetic moments determined by the three techniques. Some additional results for NpMn/sub 2/ and NpNi/sub 2/ are also reported. (AIP)

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 7267439
• Journal Information: Phys. Rev., B; (United States), Vol. 14:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MAGNETIC PROPERTIES
MANGANESE ALLOYS
NEPTUNIUM ALLOYS
NICKEL ALLOYS
OSMIUM ALLOYS
BINARY ALLOY SYSTEMS
INTERMETALLIC COMPOUNDS
MAGNETIC RESONANCE
ACTINIDE ALLOYS
ALLOY SYSTEMS
ALLOYS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RESONANCE
360104* - Metals & Alloys- Physical Properties