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

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Cited by in corpus (8)

• A magnetic Weyl semimetallic phase in thin films of Eu${}_2$Ir${}_2$O${}_7$
• 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
• 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
• Magnetotransport of single crystal Sm${}_2$Ir${}_2$O${}_7$ across the pressure-induced quantum-critical phase boundary
• Magnetism and electrical transport in Y-doped layered iridate Sr${}_2$IrO${}_4$
• Non-Fermi liquid regime in metallic pyrochlore iridates: Quantum Griffiths singularities
• Evolution of magnetic and transport properties in Cu doped pyrochlore iridate Eu2(Ir1-xCux)2O7
• Connecting the avoided quantum critical point to the magic-angle transition in three-dimensional Weyl semimetals