Competing interactions in the heavy-electron antiferromagnets Ce M sub 2 Sn sub 2 ( M =Ni, Ir, Cu, Rh, Pd, and Pt)

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.13130· OSTI ID:5812517

Beyermann, W P; Hundley, M F; Canfield, P C; Thompson, J D ^[1]; Latroche, M; Godart, C; Selsane, M ^[2]; Fisk, Z; Smith, J L ^[1]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (US)
2. Centre National de la Recherche Scientifique, 1 place A. Briand, 92190 Meudon, France (FR)

Specific-heat, magnetic-susceptibility, and resistivity measurements on annealed polycrystalline samples of Ce{ital M}{sub 2}Sn{sub 2}, with {ital M}=Ni, Ir, Cu, Rh, Pd, and Pt, indicate that each of these compounds orders antiferromagnetically at Neel temperatures {ital T}{sub {ital N}} between {similar to}0.5 and 4.2 K. Just above {ital T}{sub {ital N}}, all these materials have a significant enhancement of their electronic specific heat, which can be as large as 3--4 J/molK{sup 2}. We discuss the role of critical fluctuations on the specific heat and argue that the enhancement is associated with a large effective mass and not fluctuations. The anomalously low ordering temperatures and very large electronic specific heat suggest that {ital T}{sub {ital N}} and the Kondo temperature {ital T}{sub {ital K}} are comparable, making these materials particularly attractive for studying the competition between Kondo and Ruderman-Kittel-Kasuya-Yosida interactions. Measurements of the pressure dependence of {ital T}{sub {ital N}} in CeIr{sub 2}Sn{sub 2} were performed to explore this competition, which is discussed in terms of Doniach's Kondo-necklace model.

• OSTI ID: 5812517
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:16; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ANTIFERROMAGNETISM
CERIUM ALLOYS
COPPER ALLOYS
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC SPECIFIC HEAT
IRIDIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
NICKEL ALLOYS
PALLADIUM ALLOYS
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
POLYCRYSTALS
RARE EARTH ALLOYS
RHODIUM ALLOYS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TIN ALLOYS