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- Title
The thickness dependence of quantum oscillations in ferromagnetic Weyl metal SrRuO<sub>3</sub>.
- Authors
Kar, Uddipta; Singh, Akhilesh Kr.; Hsu, Yu-Te; Lin, Chih-Yu; Das, Bipul; Cheng, Cheng-Tung; Berben, M.; Yang, Song; Lin, Chun-Yen; Hsu, Chia-Hung; Wiedmann, S.; Lee, Wei-Cheng; Lee, Wei-Li
- Abstract
In a thin Weyl semimetal, a thickness dependent Weyl-orbit quantum oscillation was proposed to exist, originating from a nonlocal cyclotron orbit via electron tunnelings between top and bottom Fermi-arc surface states. Here, magneto-transport measurements were carried out on untwinned Weyl metal SrRuO3 thin films. In particular, quantum oscillations with a frequency Fs1 ≈ 30 T were identified, corresponding to a small Fermi pocket with a light effective mass. Its oscillation amplitude appears to be at maximum for thicknesses in a range of 10 to 20 nm, and the phase of oscillation exhibits a systematic change with film thickness. The constructed Landau fan diagram shows an unusual concave downward curvature in the 1/μ0Hn-n curve, where n is the Landau level index. From thickness and field-orientation dependence, the Fs1 oscillation is attributed to be of surface origin. Those findings can be understood within the framework of the Weyl-orbit quantum oscillation effect with non-adiabatic corrections.
- Subjects
FERROMAGNETIC materials; FREQUENCIES of oscillating systems; PHASE oscillations; OSCILLATIONS; LANDAU levels; SEMIMETALS
- Publication
NPJ Quantum Materials, 2023, Vol 8, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-023-00540-3