The thickness dependence of quantum oscillations in ferromagnetic Weyl metal SrRuO${}_3$

Abstract

Quantum oscillations in resistivity and magnetization at high magnetic fields are a macroscopic fingerprint of the energy quantization due to the cyclotron motion of quasiparticles. In a thin Weyl semimetal, a unique thickness dependent Weyl-orbit quantum oscillation was proposed to exist, originating from a nonlocal cyclotron orbit via the electron tunneling between the top and bottom Fermi-arc surface states. Here, untwinned and high crystalline Weyl metal SrRuO${}_3$ thin films with different thicknesses were grown on miscut SrTiO${}_3$ (001) substrates. Magneto-transport measurements were carried out in magnetic fields up to 35 T, and quantum oscillations with different frequencies were observed and compared to the calculated band structure. In particular, we discovered a frequency $F\approx$ 30 T at low temperatures and above 3 T that corresponds to a small Fermi pocket with a light effective mass. Its oscillation amplitude appears to be at maximum for film thicknesses in a range of 10 to 20 nm, and the phase of the oscillation exhibits a systematic change with the film thickness. After isolating the well separated frequencies, the constructed Landau fan diagram shows an unusual concave downward curvature in the 1/${\mu }_0{H}_n$-$n$ curve, where $n$ is the Landau level index. Based on the rigorous analysis of the thickness and field-orientation dependence of the quantum oscillations, the oscillation with $F\approx$ 30 T is attributed to be of surface origin, which is related to the Fermi-arc surface state originating from non-overlapping Weyl nodes projected on the film's surface plane. Those findings can be understood within the framework of the Weyl-orbit quantum oscillation effect with non-adiabatic corrections.

27 pages, 6 figures

References in corpus (3)

• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Quasiparticle Mass Enhancement and Temperature Dependence of the Electronic Structure of Ferromagnetic SrRuO3 Thin Films
• Absence of signatures of Weyl orbits in the thickness dependence of quantum transport in cadmium arsenide

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• Quantum Oscillation Signatures of Fermi Arcs in Tunnel Magnetoconductance
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• SrRuO3 under tensile strain: Thickness-dependent electronic and magnetic properties
• Unconventional two-dimensional quantum oscillations in three-dimensional thick SrRuO${}_3$ films
• Correlated Ligand Electrons in the Transition-Metal Oxide SrRuO${}_3$
• Single monolayer ferromagnetic perovskite SrRuO3 with high conductivity and strong ferromagnetism