Oxygen vacancy-driven orbital multichannel Kondo effect in Dirac nodal line metals IrO2 and RuO2

Sheng-Shiuan Yeh, Ta-Kang Su, An-Shao Lien, Farzaneh Zamani, Johann Kroha, Chao-Ching Liao, Stefan Kirchner () and Juhn-Jong Lin ()
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Sheng-Shiuan Yeh: Institute of Physics, National Chiao Tung University
Ta-Kang Su: Institute of Physics, National Chiao Tung University
An-Shao Lien: Institute of Physics, National Chiao Tung University
Farzaneh Zamani: Universität Bonn
Johann Kroha: Universität Bonn
Chao-Ching Liao: Institute of Physics, National Chiao Tung University
Stefan Kirchner: Zhejiang University
Juhn-Jong Lin: Institute of Physics, National Chiao Tung University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Strong electron correlations have long been recognized as driving the emergence of novel phases of matter. A well recognized example is high-temperature superconductivity which cannot be understood in terms of the standard weak-coupling theory. The exotic properties that accompany the formation of the two-channel Kondo (2CK) effect, including the emergence of an unconventional metallic state in the low-energy limit, also originate from strong electron interactions. Despite its paradigmatic role for the formation of non-standard metal behavior, the stringent conditions required for its emergence have made the observation of the nonmagnetic, orbital 2CK effect in real quantum materials difficult, if not impossible. We report the observation of orbital one- and two-channel Kondo physics in the symmetry-enforced Dirac nodal line (DNL) metals IrO2 and RuO2 nanowires and show that the symmetries that enforce the existence of DNLs also promote the formation of nonmagnetic Kondo correlations. Rutile oxide nanostructures thus form a versatile quantum matter platform to engineer and explore intrinsic, interacting topological states of matter.

Date: 2020
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DOI: 10.1038/s41467-020-18407-7

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