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Tricritical phenomena at the γ→α transition in Ce0.9-xLaxTh0.1 alloys
Lashley, JC Lawson, AC Cooley, JC Mihaila, B Opeil, CP Pham, L Hults, WL Smith, JL Schmiedeshoff, GM Drymiotis, FR
Lashley, JC
Lawson, AC
Cooley, JC
Mihaila, B
Opeil, CP
Pham, L
Hults, WL
Smith, JL
Schmiedeshoff, GM
Drymiotis, FR
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Journal Article
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2006-12-11
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10.1103/PhysRevLett.97.235701
Abstract
The γ→α isostructural transition in the Ce0.9-xLaxTh0.1 system is measured as a function of La alloying using specific heat, magnetic susceptibility, resistivity, thermal expansivity or striction measurements. A line of discontinuous transitions, as indicated by the change in volume, decreases exponentially from 118 K to close to 0 K with increasing La doping, and the transition changes from being first-order to continuous at a critical concentration, xc0.14. At the tricritical point, the coefficient of the linear T term in the specific heat γ and the magnetic susceptibility increase rapidly near xc and approach large values at x=0.35 signifying that a heavy Fermi-liquid state evolves at large doping. The Wilson ratio reaches a value above 2 for a narrow range of concentrations near xc, where the specific heat and susceptibility vary most rapidly with the doping concentration. © 2006 The American Physical Society.
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Physical Review Letters
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