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- Title
Clues to potential dipolar-Kondo and RKKY interactions in a polar metal.
- Authors
Yang, Xiaohui; Hu, Wanghua; Wang, Jialu; Xu, Zhuokai; Wang, Tao; Lou, Zhefeng; Lin, Xiao
- Abstract
The coexistence of electric dipoles and itinerant electrons in a solid was postulated decades ago, before being experimentally established in several 'polar metals' during the last decade. Here, we report a concentration-driven polar-to-nonpolar phase transition in electron-doped BaTiO3. Comparing our case with other polar metals, we find a particular threshold concentration (n*) linked to the dipole density (nd). The universal ratio n d n * ≈ 8.0 (6) suggests a common mechanism across different polar systems, possibly explained by a dipolar Ruderman-Kittel-Kasuya-Yosida theory. Moreover, in BaTiO3, we observe enhanced thermopower and upturn on resistivity at low temperatures near n*, resembling the Kondo effect. We argue that local electric dipoles act as two-level-systems, whose fluctuations couple with surrounding electron clouds, giving rise to a potential dipolar-counterpart of the Kondo effect. Our findings unveil a mostly uncharted territory for exploring emerging physics associated with electron-dipole correlations, encouraging further theoretical work on dipolar-RKKY and Kondo interactions.
- Subjects
PHASE transitions; KONDO effect; THERMOELECTRIC power; METALS; LOW temperatures
- Publication
NPJ Quantum Materials, 2023, Vol 8, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-023-00579-2