We report experimental signatures of topological transitions among the Weyl semimetal states of pyrochlore ${\mathrm{Pr}}_2{\mathrm{Ir}}_2{\mathrm{O}}_7$, where the Kondo coupling between the Ir topological electrons and the spin-ice-like orders of Pr moments plays a decisive role. The magnetic-field dependence of resistivity and the Hall conductivity exhibits a plateau and a sharp jump associated with a magnetic-field hysteresis, similar to a liquid-gas-like transition in a dipolar spin-ice system. Furthermore, the Kondo coupling is controlled by hydrostatic pressure, revealing that the field-induced displacement of Weyl points in the momentum space strongly depends on the respective electronic state as well as on the Kondo coupling strength. These observations pave a route toward the engineering of band topology in hybrid quantum materials with relativistic conduction electrons and localized magnetic moments.

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• Electrical conductivity
• Hall effect
• Magnetic phase transitions
• Strongly correlated systems
• Topological materials