Coexistence of high electrical conductivity and weak ferromagnetism in Cr doped Y${}_2$Ir${}_2$O${}_7$ pyrochlore iridate

Abstract

We report the structural, magnetic and electrical transport properties of Y${}_2$Ir${}_{2-x}$Cr${}_x$O${}_7$ pyrochlore iridates. The chemical doping leads to order of magnitude enhancement of electrical conductivity. The introduction of Cr3+ at Ir4+ site tends to distort the Ir-O6 octahedra and suppresses antiferromagnetic correlation. The X-ray photoemission spectroscopy measurements suggest the coexistence of Ir4+ and Ir5+ valence states in the Y${}_2$Ir${}_{2-x}$Cr${}_x$O${}_7$ compounds. The concentration of Ir5+ is enhanced with Cr doping, leading to weak ferromagnetism and enhanced electrical conductivity. A cluster-glass like transition is also observed at low temperature with Cr doping, possibly due to competing ferromagnetic and antiferromagnetic interaction.

References in corpus (27)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Magnetic Pyrochlore Oxides
• Correlated quantum phenomena in the strong spin-orbit regime
• Mott physics and band topology in materials with strong spin-orbit interaction
• Superconductivity at 1 K in Cd2Re2O7
• Topological insulators and metal-insulator transition in the pyrochlore iridates
• Static Critical Behavior of the Spin-Freezing Transition in the Geometrically Frustrated Pyrochlore Antiferromagnet Y2Mo2O7
• Signatures of Spin Glass Freezing in NiO Nanoparticles
• Metal-Nonmetal Changeover in Pyrochlore Iridates
• Computational Design of Axion Insulators Based on 5d Spinels Compounds
• Magnetic orders and topological phases from f-d exchange in pyrochlore iridates
• Pressure Tuned Insulator to Metal Transition in Eu${}_2$Ir${}_2$O${}_7$
• Structure and Magnetic Properties of the Pyrochlore Iridate Y2Ir2O7
• Magnetic Order in the Pyrochlore Iridates A2Ir2O7 (A = Y, Yb)
• Metal-insulator transition and topological properties of pyrochlore iridates
• Enhanced weak ferromagnetism and conductivity in hole-doped pyrochlore iridate Y2Ir2O7
• Direct Evidence for the 'All-in/All-out' Magnetic Structure in the Pyrochlore Iridates from $\mu$SR
• Filling Control of the Pyrochlore Oxide Y2Ir2O7
• Mott Variable Range Hopping and Weak Antilocalization Effect in Heteroepitaxial Na2IrO3 Thin Films
• Evolution of structure, magnetism and electronic transport in doped pyrochlore iridate Y${}_2$Ir${}_{2-x}$Ru${}_x$O${}_7$
• Nonequilibrium low temperature phase in pyrochlore iridate Y${}_2$Ir${}_2$O${}_7$: Possibility of glass-like dynamics
• Spin-Glass-like Transition and Hall Resistivity of Y2-xBixIr2O7
• Negative longitudinal magnetoresistance in the density wave phase of Y${}_2$Ir${}_2$O${}_7$
• Colossal enhancement of electrical conductivity in Y2Ir2O7 nanoparticles
• Fragile singlet ground state magnetism in pyrochlore osmates R2Os2O7 (R=Y and Ho)
• Evidence of density waves in single crystalline nanowires of Pyrochlore Iridates
• Suppression of long range magnetic ordering and electrical conduction in Y${}_{1.7}$Bi${}_{0.3}$Ir${}_2$O${}_7$ thin film

Cited by in corpus (4)

• 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
• Identification of Griffiths-like phase and its evolution in Cr substituted pyrochlore iridates $Y_{2}I{r}_2{O}_7$
• Non-Fermi liquid regime in metallic pyrochlore iridates: Quantum Griffiths singularities
• Enhanced magnetic and optical properties of oxygen deficient TiO${}_{2-\delta }$ nanoparticles synthesized by environment-friendly green route using whole plant extract of Phyllanthus niruri