Proximitized electronic transport in pyrochlore heterostructures of frustrated magnets

Date

May 28, 2025

Time

2:30 PM - 3:30 PM

Speaker

Prof. Jian Liu

Affiliation

University of Tennesse, Knoxville

Language

en

Main Topic

Materialien

Host

Rita Taubert

Description

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 how to exploit the emergent fluctuations and excitations to mediate electronic behaviors, which requires introducing charge carriers that interact with the localized spins without destroying their collective spin states. In this talk, I will discuss our recent work on proximitized transport measurements on conductive thin films that are epitaxially grown on insulating frustrated magnets. Our results show that, by designing an epitaxial Bi2Ir2O7/Dy2Ti2O7 heterostructure, the breaking of the spin-ice rule in insulating Dy2Ti2O7 leads to a charge response in the conducting Bi2Ir2O7 measured as a magnetoresistance anomaly during the Kagome ice-to-saturated ice transition. The anomaly also captures the thermal evolution of the transition that is characteristic of magnetic monopole condensation. By extending this method to a Bi2Ir2O7/Yb2Ti2O7 heterostructure, we show that the proximitized charge transport is significantly enhanced under quantum spin fluctuations. The proximity effects are evidenced by the scaling behavior of the Bi2Ir2O7 resistance in correspondence with the scaling of the dynamic spin-correlation function of Yb2Ti2O7. The proximitized transport can also be effectively tuned by suppressing the quantum spin fluctuations with a magnetic field. The approach of proximitized transport thus paves a pathway for harnessing insulating quantum magnet for novel electronic phenomena.

Links

• Seminars at the IFW

Last modified: May 28, 2025, 7:39:42 AM