Antiferromagnetism and enhanced heat in CeM sub 2 Sn sub 2 (M = Ni, Ir, Cu, Rh, Pd, and Pt)

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6719145

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

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1. Los Alamos National Lab., NM (USA)
2. Centre National de la Recherche Scientifique, 92 - Meudon-Bellevue (France)

Recently a new series of compounds has been discovered by M. Selsane et al. which has a structure close to CeCu{sub 2}Si{sub 2}. Specific heat, dc susceptibility, and resistivity measurements on annealed, polycrystalline samples of CeM{sub 2} Sn{sub 2} where M = Ni, Ir, Cu, Rh, Pd, or Pt indicate that each of these compounds orders antiferromagnetically with transition temperatures ranging from T{sub N} = 4.1 K to {approx} 0.5 K. All these materials have significant enhancements of the specific heat just before the transition which can be as large as {approximately}3.7 J/mole-K{sup 2} in some cases. Provided the enhanced heat capacities above T{sub N} are associated with large effective masses, the anomalously low ordering temperature and the very large C/T suggest that T{sub N} and the Kondo temperature T{sub K} are comparable, making these materials particularly attractive for studying the interplay between these competing interactions. In all cases except M = Ir, the susceptibility follows a Curie-Weiss behavior with a high temperature effective moment {mu}{sub eff} {approximately}2.54 {mu}{sub B}/Ce, while the Ir compound has a very strong mixed-valent nature. 14 refs., 3 figs., 2 tabs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: DOE/MA
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6719145
• Report Number(s): LA-UR-90-2363; CONF-900751-2; ON: DE90014924; TRN: 90-027920
• Resource Relation: Conference: 6. international conference on valence fluctuations, Rio de Janeiro (Brazil), 9-13 Jul 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM COMPOUNDS
SPECIFIC HEAT
COPPER COMPOUNDS
IRIDIUM COMPOUNDS
NICKEL COMPOUNDS
PALLADIUM COMPOUNDS
PLATINUM COMPOUNDS
RHODIUM COMPOUNDS
TIN COMPOUNDS
ANTIFERROMAGNETISM
CRYSTAL STRUCTURE
INTERMETALLIC COMPOUNDS
MAGNETIC PROPERTIES
TEMPERATURE DEPENDENCE
ALLOYS
MAGNETISM
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties