title: Localized 5f electrons in superconducting PuCoIn₅: consequences for superconductivity in PuCoGa₅.
abstract: The physical properties of the first In analog of the PuMGa(5) (M = Co, Rh) family of superconductors, PuCoIn(5), are reported. With its unit cell volume being 28% larger than that of PuCoGa(5), the characteristic spin-fluctuation energy scale of PuCoIn(5) is three to four times smaller than that of PuCoGa(5), which suggests that the Pu 5f electrons are in a more localized state relative to PuCoGa(5). This raises the possibility that the high superconducting transition temperature T(c) = 18.5 K of PuCoGa(5) stems from the proximity to a valence instability, while the superconductivity at T(c) = 2.5 K of PuCoIn(5) is mediated by antiferromagnetic spin fluctuations associated with a quantum critical point.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Bauer
authors.forename: M M
authors.initials: MM
authors.lastname: Altarawneh
authors.forename: P H
authors.initials: PH
authors.lastname: Tobash
authors.forename: K
authors.initials: K
authors.lastname: Gofryk
authors.forename: O E
authors.initials: OE
authors.lastname: Ayala-Valenzuela
authors.forename: J N
authors.initials: JN
authors.lastname: Mitchell
authors.forename: R D
authors.initials: RD
authors.lastname: McDonald
authors.forename: C H
authors.initials: CH
authors.lastname: Mielke
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.forename: J-C
authors.initials: JC
authors.lastname: Griveau
authors.forename: E
authors.initials: E
authors.lastname: Colineau
authors.forename: R
authors.initials: R
authors.lastname: Eloirdi
authors.forename: R
authors.initials: R
authors.lastname: Caciuffo
authors.forename: B L
authors.initials: BL
authors.lastname: Scott
authors.forename: O
authors.initials: O
authors.lastname: Janka
authors.forename: S M
authors.initials: SM
authors.lastname: Kauzlarich
authors.forename: J D
authors.initials: JD
authors.lastname: Thompson
mesh_terms: D002627:Chemistry, Physical / Q000379:methods*; D003035:Cobalt / Q000737:chemistry*; D004553:Electric Conductivity; D004583:Electrons; D005708:Gallium / Q000737:chemistry*; D006358:Hot Temperature; D007204:Indium / Q000737:chemistry*; D007477:Ions; D008280:Magnetics; D015233:Models, Statistical; D011005:Plutonium / Q000737:chemistry*; D011312:Pressure; D013696:Temperature; D044366:Transition Temperature
chemical_list: D007477:Ions; D007204:Indium; D003035:Cobalt; D011005:Plutonium; D005708:Gallium