Experimental signatures of versatile Weyl semimetal in pyrochlore iridate with spin-ice like magnetic orders

We report experimental signatures of topological transitions among the Weyl semimetal states of pyrochlore $\pio $, 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 dipolar spin ice system. Furthermore, the Kondo coupling is controlled by the 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.