Comparative study of thermal and magnetic properties of CeT{sub y}X{sub 4{minus}y} ferromagnets

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.5380· OSTI ID:538573

Sereni, J G; Trovarelli, O ^[1]; Schmerber, G; Kappler, J P ^[2]

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1. Centro Atomico Bariloche (CNEA), 8400 S. C. de Bariloche (Argentina)
2. Institut de Physique et Chimie des Materiaux de Strasbourg, Groupe dEtude des Materiaux Metalliques, Universite Louis Pascal, 23 rue du Loess, 67037 Strasbourg (France)

Low-temperature thermal (specific heat, C{sub P}) and magnetic [ac susceptibility, {chi}{sub ac}, and isothermal magnetization M(B)] measurements on CeT{sub y}X{sub 4{minus}y} ferromagnets (with T=Ni, Cu, Pd, Ag, Au, and X=Ga, Al, with 0.3{lt}y{lt}0.7) are reported. With the exception of T=Ni, all compounds with X=Ga show a typical second-order ferromagnetic transition. In the case of T=Ni, magnetic correlations set in at T{approx}3T{sub C} (T{sub C} being the Curie temperature) and the C{sub P}(T) and {chi}{sub ac}(T) maxima (at 3.3 and 4.2 K, respectively) do not coincide, while the M(B) curves reveal an antiferromagnetic character at lower temperatures. In these systems, the magnetic entropy of the ordered phase is larger than 85{percent} of Rln2, in coincidence with the low values of the Sommerfeld coefficient {gamma}{le}10 mJ/molK{sup 2}. For T=Ag and X=Al, a strong diamagnetic signal was observed at T{sub s}=0.63 K in {chi}{sub ac}(T), with the characteristics of a superconducting component. The thermodynamical properties of these compounds confirm the lack of hybridization when the Ce atom is in a ferromagnetic ground state. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538573
• Journal Information: Physical Review, B: Condensed Matter, Vol. 56, Issue 9; Other Information: PBD: Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM ALLOYS
MAGNETIZATION
MAGNETIC SUSCEPTIBILITY
SPECIFIC HEAT
NICKEL ALLOYS
COPPER ALLOYS
PALLADIUM ALLOYS
SILVER ALLOYS
GOLD ALLOYS
ALUMINIUM ALLOYS
GALLIUM ALLOYS
CURIE POINT
MAGNETIC PROPERTIES
ENTROPY
FERROMAGNETISM
ANTIFERROMAGNETISM
FERROMAGNETIC MATERIALS
ANTIFERROMAGNETIC MATERIALS
SUPERCONDUCTIVITY
GROUND STATES
COMPARATIVE EVALUATIONS
INTERMETALLIC COMPOUNDS
PHASE TRANSFORMATIONS