Ground-state properties and magnetic excitations of the mixed valence state: Cerium-based alloys

Journal Article · Tue Dec 01 04:00:00 EST 1981 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.24.6242· OSTI ID:5937856

Grier, B H; Parks, R D; Shapiro, S M; Majkrzak, C F

Both the static and dynamic magnetic behavior of the mixed valence system, Ce/sub 0.9-x/La/sub x/Th/sub 0.1/, have been studied through magnetic susceptibility and inelastic neutron scattering experiments. For small La concentrations (x< or approx. =0.09), the system exhibits a first-order valence transition to a strongly mixed valent ground state, whereas nearly integral valent, local moment behavior results for x> or approx. =0.4. For the strongly mixed valent system Ce/sub 0.74/Th/sub 0.26/, the inelastic neutron spectra are characterized by a broad quasielastic peak, while for x> or approx. =0.14 in the Ce/sub 0.9-x/La/sub x/Th/sub 0.1/ system, the mixed valence effects are weaker and crystalline electric field excitations begin to appear. This occurs when the spin-fluctuation energies associated with the mixed valent state are smaller than the crystal-field excitation energy. Simple relationships emerge which connect various energy-related parameters, namely, the valence transition temperature, the Fermi liquid susceptibility at T = 0 and the ground-state spin-fluctuation energy as measured in the neutron scattering experiments.

• Research Organization: Department of Physics, Polytechnic Institute of New York, Brooklyn, New York 11201
• OSTI ID: 5937856
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 24:11; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
CERIUM ALLOYS
CERIUM BASE ALLOYS
COHERENT SCATTERING
DIFFRACTION
ENERGY LEVELS
GROUND STATES
INELASTIC SCATTERING
LANTHANUM ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH ALLOYS
SCATTERING
THORIUM ALLOYS
VALENCE