Critical neutron scattering experiments on USb

Conference · Wed Dec 31 23:00:00 EST 1975 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:7317831

Lander, G H ^[1]; Sparlin, D M; Vogt, O

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1. Argonne National Lab., IL

Uranium antimonide (NaCl crystal structure) is a type I antiferromagnet (T/sub n/ = 241.2 +- 0.1/sup 0/K) with moments in ferromagnetic (001) layers stacked antiferromagnetically +- +-. The spin direction is (001). The critical neutron scattering has been measured from a single crystal as a function of temperature and reduced wave vector q. Below T/sub N/ the power law M/M/sub o/ = D(1-T/T/sub N/)/sup ..beta../ holds for 10/sup -3/ less than or equal to 1-T/T/sub N/ less than or equal to 10/sup -1/ with D = 1.35 +- 0.05 and ..beta.. = 0.32 +- 0.02, in agreement with theory for a three dimensional system. A detailed study of the scattering shows two unusual features. First, the transverse susceptibility (measured around the (001) point) is vanishingly small. Second, considerable anisotropy was detected in the longitudinal spin correlations, depending on whether directions parallel or perpendicular to the spin ordering direction, k/sub 11//sup c/ and k/sub 11//sup a/, respectively, are considered. Both correlation lengths vary as (T/T/sub N/-1)/sup ..nu../ where ..nu.. approximately 0.32 +- 0.01. For all T, k/sub 11//sup c/ approximately 6k/sub 11//sup a/ suggesting the presence of anisotropic exchange. This arises from quadrupole--quadrupole interactions within the GAMMA/sub 8/ ground state of this 5f/sup 3/ electron system.

• OSTI ID: 7317831
• Journal Information: AIP (Am. Inst. Phys.) Conf. Proc.; (United States), Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Vol. 34; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOY SYSTEMS
ALLOYS
ANGULAR MOMENTUM
ANTIFERROMAGNETIC MATERIALS
ANTIMONY ALLOYS
BARYONS
BINARY ALLOY SYSTEMS
CRYSTALS
ELECTRONIC STRUCTURE
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERMETALLIC COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
MONOCRYSTALS
NEUTRONS
NUCLEONS
PARTICLE PROPERTIES
PNICTIDES
SCATTERING
SPIN
TEMPERATURE DEPENDENCE
URANIUM ALLOYS