Anomalous lattice contraction and emergent electronic phases in Bi-doped Eu${}_2$Ir${}_2$O${}_7$

Abstract

We study the pyrochlore series (Eu${}_{1-x}$Bi${}_x$)${}_2$Ir${}_2$O${}_7$ for $0\le x\le 1$. We show that for small $x$, the lattice undergoes an anomalous contraction but the all-in/all-out and metal-to-insulator transitions remain robust, and the resistivity approaches a $1/T$ dependence at low-T, suggesting proximity to the Weyl semimetallic phase, as previously predicted theoretically. At the boundary between Eu${}_2$Ir${}_2$O${}_7$ and Bi${}_2$Ir${}_2$O${}_7$ a qualitatively different ground state emerges, which is characterized by its unusual metallic behavior and absence of magnetic ordering at least down to $0.02$ K.

5 Pages, 4 figures

References in corpus (7)

• A New Type of Quantum Criticality in the Pyrochlore Iridates
• Pyrochlore electrons under pressure, heat and field: shedding light on the iridates
• Quantum Criticality of Topological Phase Transitions in 3D Interacting Electronic Systems
• Direct Evidence for the 'All-in/All-out' Magnetic Structure in the Pyrochlore Iridates from $\mu$SR
• Electron interactions, spin-orbit coupling, intersite correlations in pyrochlore iridates
• Observation of non-Fermi liquid behavior in hole doped Eu2Ir2O7
• Doping driven structural distortion in the bilayer iridate (Sr${}_{1-x}$La${}_x$)${}_3$Ir${}_2$O${}_7$

Cited by in corpus (3)

• Magnetic and transport properties in pyrochlore iridates (Y${}_{1-x}$Pr${}_x$)${}_2$Ir${}_2$O${}_7$: The role of $f$-$d$ exchange interaction and $d$-$p$ orbital hybridization
• Magnetism and electrical transport in Y-doped layered iridate Sr${}_2$IrO${}_4$
• Non-Fermi liquid regime in metallic pyrochlore iridates: Quantum Griffiths singularities