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.
翻译：Ts = 330 K 和 280 K 表示有伪伽普形成,在TMI = 270 K 和 200 K 以上的金属区域,在TMI = 270 K 和 200 K 的金属区域,发现有金属显示非磁性隔热器过渡。在TMI 以上金属区域,在结构阶段过渡的同时,抗力和磁易感性出现微弱反常,表明有伪伽普形成。通过用Rh替代Ru,这两种过渡被压抑。我们发现,在伪伽普阶段临界点周围,超导性最大Tc = 3.7 K 和 Tc = 1.8 K,其组成范围狭窄,Rh 含量xc = 04.5 和 xc = 0.25 Ru1-xRhxP 和 Ru1-xRhx As,它们可能为我们提供在量子临界点实现超导力的新型非磁性路径。
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