Gap in the magnetic excitation spectrum of Ce sub 3 Bi sub 4 Pt sub 3

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.6832· OSTI ID:5238443

Severing, A ^[1]; Thompson, J D; Canfield, P C; Fisk, Z ^[2]; Riseborough, P ^[3]

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1. Institut Laue-Langevin, Grenoble (France)
2. Los Alamos National Laboratory, Los Alamos, New Mexico (USA)
3. Polytechnic University, Brooklyn, New York (USA)

Static-susceptibility and thermal-expansion measurements indicate that Ce{sub 3}Bi{sub 4}Pt{sub 3} is mixed-valent-like, whereas transport measurements reveal a gap of {Delta}=5 meV in the electronic excitation spectrum. We report the magnetic response of Ce{sub 3}Bi{sub 4}Pt{sub 3}, at temperatures between 2 and 150 K, determined with incident neutron energies of 3.1, 17, and 69 meV. The isostructural, nonmagnetic reference compound La{sub 3}Bi{sub 4}Pt{sub 3} was also studied at the same temperatures and energies so that phonon contributions could be subtracted accurately. At 2 K, a gap {Delta}{sub {ital m}}=12 meV is present in the magnetic excitation spectrum: the 3.1-, 17-, and 69-meV data consistently show that the magnetic intensity is zero for energy transfers less than 12 meV, rises sharply between 12 and 20 meV, and falls off smoothly beyond. Above 50 K, the gap in the spin-spin correlation function starts to fill. The neutron results reproduce the temperature dependence of the bulk susceptibility. The relationship between these and other measurements will be discussed.

• OSTI ID: 5238443
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:13; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BISMUTH ALLOYS
CERIUM ALLOYS
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
ELECTRONIC STRUCTURE
ENERGY GAP
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EXCITATION
MILLI EV RANGE
MONOCRYSTALS
NEUTRON DIFFRACTION
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
RARE EARTH ALLOYS
SCATTERING