Evolution of structure, magnetism and electronic transport in doped pyrochlore iridate Y${}_2$Ir${}_{2-x}$Ru${}_x$O${}_7$

Abstract

The interplay between spin-orbit coupling (SOC) and electron correlation ($U$) is considered for many exotic phenomena in iridium oxides. We have investigated the evolution of structural, magnetic and electronic properties in pyrochlore iridate Y${}_2$Ir${}_{2-x}$Ru${}_x$O${}_7$ where the substitution of Ru has been aimed to tune this interplay. The Ru substitution does not introduce any structural phase transition, however, we do observe an evolution of lattice parameters with the doping level $x$. X-ray photoemission spectroscopy (XPS) study indicates Ru adopts charge state of Ru${}^{4+}$ and replaces the Ir${}^{4+}$ accordingly. Magnetization data reveal both the onset of magnetic irreversibility and the magnetic moment decreases with progressive substitution of Ru. These materials show non-equilibrium low temperature magnetic state as revealed by magnetic relaxation data. Interestingly, we find magnetic relaxation rate increases with substitution of Ru. The electrical resistivity shows an insulating behavior in whole temperature range, however, resistivity decreases with substitution of Ru. Nature of electronic conduction has been found to follow power-law behavior for all the materials.

arXiv commentTo appear in Phys. Rev. B

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• Coexistence of high electrical conductivity and weak ferromagnetism in Cr doped Y${}_2$Ir${}_2$O${}_7$ pyrochlore iridate
• Influence of electronic structure parameters on the electrical transport and magnetic properties of $Y_{2-x}B{i}_{x}I{r}_2{O}_7$ pyrochlore iridates
• Role of spin-phonon and electron-phonon interactions in phonon renormalization of (Eu${}_{1-x}$Bi${}_x$)${}_2$Ir${}_2$O${}_7$ across the metal-insulator phase transition: Temperature-dependent Raman and X-ray studies
• Identification of Griffiths-like phase and its evolution in Cr substituted pyrochlore iridates $Y_{2}I{r}_2{O}_7$
• Nonmagnetic substitution in pyrochlore iridate Y${}_2$(Ir${}_{1-x}$Ti${}_x$)${}_2$O${}_7$: Structure, magnetism and electronic properties
• Evolution of magnetic and transport properties in Cu doped pyrochlore iridate Eu2(Ir1-xCux)2O7
• Charge density wave and Weyl Semimetal phase in Y${}_2$Ir${}_2$O${}_7$
• Fluorite-related iridate Pr${}_3$IrO${}_7$: Crystal growth, structure, magnetism, thermodynamic, and optical properties
• Optical conductivity of the metallic pyrochlore iridate Pr${}_2$Ir${}_2$O${}_7$: Influence of spin-orbit coupling and electronic correlations on the electronic structure