Anomalous magnetoresistance by breaking ice rule in Bi<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub>/Dy<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> heterostructure.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36918538.
- Also identified by DOI 10.1038/s41467-023-36886-2 and PMC identifier 10014844.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
While geometrically frustrated quantum magnets host rich exotic spin states with potentials for revolutionary quantum technologies, most of them are necessarily good insulators which are difficult to be integrated with modern electrical circuit. The grand challenge is to electrically detect the emergent fluctuations and excitations by introducing charge carriers that interact with the localized spins without destroying their collective spin states. Here, we show that, by designing a Bi<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub>/Dy<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> heterostructure, the breaking of the spin-ice rule in insulating Dy<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> leads to a charge response in the conducting Bi<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub> measured as anomalous magnetoresistance during the field-induced Kagome ice-to-saturated ice transition. The magnetoresistive anomaly also captures the characteristic angular and temperature dependence of this ice-rule-breaking transition, which has been understood as magnetic monopole condensation. These results demonstrate a novel heteroepitaxial approach for electronically probing the transition between exotic insulating spin states, laying out a blueprint for the metallization of frustrated quantum magnets.