title: Superconducting quantum critical point in CeCoIn(5-x)Sn(x).
abstract: We report a combined pressure-doping study in the nearly two-dimensional heavy fermion superconductor CeCoIn5 as its superconducting phase is driven to the normal state by Sn doping and/or applied pressure. Temperature-pressure-dependent electrical resistivity measurements were performed at the vicinity of a superconducting quantum critical point where Tc→0. A universal plot of the concentration- and pressure-dependent phase diagram suggests that for the concentrations studied a single mechanism is responsible for reducing Tc and bringing the system to the superconducting quantum critical point. A two-band model with hybridization controlled by pressure and doping provides a consistent description of the phase diagram and the suppression of the d-wave superconductivity in this material.
authors.affiliation: Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180, Rio de Janeiro, RJ, Brazil. smr@if.uff.br
authors.forename: S M
authors.initials: SM
authors.lastname: Ramos
authors.forename: M B
authors.initials: MB
authors.lastname: Fontes
authors.forename: E N
authors.initials: EN
authors.lastname: Hering
authors.forename: M A
authors.initials: MA
authors.lastname: Continentino
authors.forename: E
authors.initials: E
authors.lastname: Baggio-Saitovich
authors.forename: F Dinóla
authors.initials: FD
authors.lastname: Neto
authors.forename: E M
authors.initials: EM
authors.lastname: Bittar
authors.forename: P G
authors.initials: PG
authors.lastname: Pagliuso
authors.forename: E D
authors.initials: ED
authors.lastname: Bauer
authors.forename: J L
authors.initials: JL
authors.lastname: Sarrao
authors.forename: J D
authors.initials: JD
authors.lastname: Thompson