The systems exhibiting coexistence of Kondo coupling and magnetic frustration offer a rich platform for exploring the interplay between these competing effects, which often give rise to exotic quantum phases. Rare-earth-doped metallic pyrochlores with noncoplanar spin configurations, pronounced Ising anisotropy, and strong $f\text{–}d$ exchange coupling, represent an intriguing class of materials for probing the complex interaction between geometrical frustration and potential Kondo interactions. In this study, we investigate the magnetic and electronic transport properties of ${\mathrm{Bi}}_{1.1}{\mathrm{Nd}}_{0.9}{\mathrm{Ru}}_2{\mathrm{O}}_7$ (BNRO), a rare-earth-doped pyrochlore oxide that bridges the nonmagnetic metallic ${\mathrm{Bi}}_2{\mathrm{Ru}}_2{\mathrm{O}}_7$ (BRO) and the weakly frustrated, magnetically insulating ${\mathrm{Nd}}_2{\mathrm{Ru}}_2{\mathrm{O}}_7$ (NRO). From low-temperature magnetic susceptibility measurements, the effective magnetic moment of ${\mathrm{Nd}}^{3+}$ is estimated to be $2.38{\mu }_B/\mathrm{Nd}$, and the isothermal magnetization confirms the presence of Ising anisotropy. A Schottky-like anomaly observed in the low-temperature specific heat data indicates the presence of $f\text{–}d$ exchange coupling between the ${\mathrm{Nd}}^{3+}$ and ${\mathrm{Ru}}^{4+}$ ions. However, this coupling is found to be relatively weak to induce robust spin chirality in the Ru sublattice that could manifest as a geometrical Hall effect (GHE). Indeed, Hall measurements did not reveal any signatures of GHE. The absence of GHE in BNRO is attributed to the underlying Kondo coupling, which weakens the exchange interaction between the ${\mathrm{Nd}}^{3+}$ and ${\mathrm{Ru}}^{4+}$ ions, effectively suppressing the transfer of spin chirality necessary for GHE.

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• Hall effect
• Kondo effect
• Magnetism
• Noncollinear magnets
• Pyrochlores
• Magnetization measurements
• Resistivity measurements
• Specific heat measurements