Metal-insulator transition and superconductivity induced by Rh doping in the binary pnictides RuPn (Pn=P, As, Sb)

Daigorou Hirai; Tomohiro Takayama; Daisuke Hashizume; Hidenori Takagi

doi:10.1103/PhysRevB.85.140509

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Metal-insulator transition and superconductivity induced by Rh doping in the binary pnictides RuPn (Pn=P, As, Sb)

Daigorou Hirai, Tomohiro Takayama, Daisuke Hashizume, Hidenori Takagi

DOI 10.1103/PhysRevB.85.140509 · Physical Review B

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Abstract

Binary ruthenium pnictides, RuP and RuAs, with an orthorhombic MnP structure, were found to show a metal to a nonmagnetic insulator transition at TMI = 270 and 200 K, respectively. In the metallic region above TMI, a structural phase transition, accompanied with a weak anomaly in the resistivity and the magnetic susceptibility, indicative of a pseudogap formation, was identified at Ts = 330 and 280 K, respectively. These two transitions were suppressed by substituting Ru with Rh. We found superconductivity with a maximum Tc = 3.7 and 1.8 K in a narrow composition range around the critical point for the pseudogap phase, Rh content xc = 0.45 and 0.25 for Ru1−xRhxP and Ru1−xRhxAs, respectively, which may provide us with a nonmagnetic route to superconductivity at a quantum critical point.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ru0.55Rh0.45P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.7	Pressure not reported	zero_resistance
Ru0.55Rh0.45P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.7	Pressure not reported	onset
Ru0.55Rh0.45P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.7	Pressure not reported	midpoint
Ru0.75Rh0.25As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.8	Pressure not reported	zero_resistance
Ru0.75Rh0.25As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.8	Pressure not reported	onset
Ru0.75Rh0.25As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.8	Pressure not reported	midpoint
RuSb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.2	Pressure not reported	unknown