Electrostatic tuning of Kondo effect in a rare-earth-doped wide-band-gap oxide

Yongfeng Li, Rui Deng, Weinan Lin, Yufeng Tian, Haiyang Peng, Jiabao Yi, Bin Yao, Tao Wu

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

As a long-lived theme in solid-state physics, the Kondo effect reflects the many-body physics involving the short-range Coulomb interactions between itinerant electrons and localized spins in metallic materials. Here we show that the Kondo effect is present in ZnO, a prototypical wide-band-gap oxide, doped with a rare-earth element (Gd). The localized 4f electrons of Gd ions do not produce remanent magnetism, but interact strongly with the host electrons, giving rise to a saturating resistance upturn and negative magnetoresistance at low temperatures. Furthermore, the Kondo temperature and resistance can be electrostatically modulated using electric-double-layer gating with liquid ionic electrolyte. Our experiments provide the experimental evidence of tunable Kondo effect in ZnO, underscoring the magnetic interactions between localized and itinerant electrons and the emergent transport behaviors in such doped wide-band-gap oxides.
Original languageEnglish (US)
JournalPhysical Review B
Volume87
Issue number15
DOIs
StatePublished - Apr 29 2013

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