title: Tricritical phenomena at the gamma-->alpha transition in Ce0.9-xLaxTh0.1 alloys.
abstract: The gamma-->alpha 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, x(c) approximately 0.14. At the tricritical point, the coefficient of the linear T term in the specific heat gamma and the magnetic susceptibility increase rapidly near x(c) 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 x(c), where the specific heat and susceptibility vary most rapidly with the doping concentration.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Lashley
authors.forename: A C
authors.initials: AC
authors.lastname: Lawson
authors.forename: J C
authors.initials: JC
authors.lastname: Cooley
authors.forename: B
authors.initials: B
authors.lastname: Mihaila
authors.forename: C P
authors.initials: CP
authors.lastname: Opeil
authors.forename: L
authors.initials: L
authors.lastname: Pham
authors.forename: W L
authors.initials: WL
authors.lastname: Hults
authors.forename: J L
authors.initials: JL
authors.lastname: Smith
authors.forename: G M
authors.initials: GM
authors.lastname: Schmiedeshoff
authors.forename: F R
authors.initials: FR
authors.lastname: Drymiotis
authors.forename: G
authors.initials: G
authors.lastname: Chapline
authors.forename: S
authors.initials: S
authors.lastname: Basu
authors.forename: P S
authors.initials: PS
authors.lastname: Riseborough