We report experimental signatures of topological transitions among the Weyl semimetal states of pyrochlore Pr2Ir2O7, 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.
@article{arxiv.2202.09984,
title = {Experimental signatures of versatile Weyl semimetal in pyrochlore iridate with spin-ice like magnetic orders},
author = {Kentaro Ueda and Hiroaki Ishizuka and Markus Kriener and Shunsuke Kitou and Denis Maryenko and Minoru Kawamura and Taka-hisa Arima and Masashi Kawasaki and Yoshinori Tokura},
journal= {arXiv preprint arXiv:2202.09984},
year = {2022}
}