Physics – Condensed Matter – Superconductivity
Scientific paper
2011-12-02
Phys. Rev. B, 85, 140509(R) (2012)
Physics
Condensed Matter
Superconductivity
6 pages, 4 figures, Submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevB.85.140509
Binary ruthenium pnictides, RuP and RuAs, with an orthorhombic MnP structure, were found to show a metal to a non-magnetic insulator transition at TMI = 270 K and 200 K, respectively. In the metallic region above TMI, a structural phase transition, accompanied by a weak anomaly in the resistivity and the magnetic susceptibility, indicative of a pseudo-gap formation, was identified at Ts = 330 K and 280 K, respectively. These two transitions were suppressed by substituting Ru with Rh. We found superconductivity with a maximum Tc = 3.7 K and Tc =1.8 K in a narrow composition range around the critical point for the pseudo-gap phase, Rh content xc = 0.45 and xc = 0.25 for Ru1-xRhxP and Ru1-xRhxAs, respectively, which may provide us with a novel non-magnetic route to superconductivity at a quantum critical point.
Hashizume Daisuke
Hirai D.
Takagi Hidekazu
Takayama Tsutomu
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