Specific heat and anisotropy of the nonconventional superconductors PuCoGa5 and PuRhGa5

P. Javorský; E. Colineau; F. Wastin; F. Jutier; J.-C. Griveau; P. Boulet; R. Jardin; J. Rebizant

doi:10.1103/PhysRevB.75.184501

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Specific heat and anisotropy of the nonconventional superconductors PuCoGa5 and PuRhGa5

P. Javorský, E. Colineau, F. Wastin, F. Jutier, J.-C. Griveau, P. Boulet, R. Jardin, J. Rebizant

DOI 10.1103/PhysRevB.75.184501 · Physical Review B

T1

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Abstract

We report on specific-heat measurements under a magnetic field on oriented single crystals of the nonconventional superconductors PuCoGa5 and PuRhGa5 with superconducting transition temperature Tc∼18 and 9K, respectively. In the superconducting state, the electronic specific heat follows a quadratic temperature dependence, which indicates an axial state with line nodes in the superconducting gap structure. The specific heat measured under a magnetic field applied along different crystallographic directions reveals anisotropic behavior. For both compounds, Tc decreases faster for fields applied along the c axis than for fields perpendicular to it. The value of the slope of the critical field at Tc is higher in the case of PuCoGa5, while the anisotropy effect is stronger in PuRhGa5. Further results are discussed in the context of the isostructural Ce- and Np-based materials. The possibility of the appearance of a Fulde-Ferrell-Larkin-Ovchinnikov state and/or strong spin-orbit coupling, related to the observed low-temperature linear shape of the critical field deviating from the common d-wave superconductor behavior, is considered, especially in the PuRhGa5 case.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PuCoGa5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	unknown
PuRhGa5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9	Pressure not reported	unknown
PuCoGa5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18.5	Pressure not reported	unknown
PuRhGa5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.7	Pressure not reported	unknown
PuCoGa5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17.8	Pressure not reported	unknown