Experimental signatures of a versatile Weyl semimetal in a pyrochlore iridate with spin-ice-like magnetic orders
Kentaro Ueda, Hiroaki Ishizuka, M. Kriener, Shunsuke Kitou, D. Maryenko, Minoru Kawamura, T. Arima, M. Kawasaki, Yoshinori Tokura
Abstract
A geometrically frustrated lattice provides an ideal platform to search for novel electromagnetic phenomena, since it is proven to yield exotic topological electronic states as well as novel magnetic ground states. This paper reports magnetotransport properties across the spin-ice-like magnetic order and liquid-gas-type magnetic transitions in the well-characterized pyrochlore semimetal Pr${}_{2}$Ir${}_{2}$O${}_{7}$. Remarkable field and pressure dependence of the anomalous Hall conductivity points to the dramatic change of the Weyl point locations in momentum space. These findings open up a new direction for topological band engineering in hybrid quantum materials with relativistic conduction electrons and localized magnetic moments.