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Transport properties and quantum oscillation phenomena in correlated CaVO₃ epitaxial thin films

Year: 2026
Type: dissertation
Abstract: Early transition metal oxides with perovskite structure exhibit enhanced electron correlation, serving as an ideal platform for investigating fundamental transport mechanisms in strongly correlated electron systems. In this thesis, a comprehensive study of the electronic transport properties of epitaxial thin films of orthorhombic CaVO₃ on LaAlO₃ substrates is presented. The films, grown under varying vanadium partial pressures, exhibit distinctly different residual resistivity ratios (RRR), including samples with the highest RRR values reported to date. Temperature- and magnetic field-dependent measurements of the resistivity and Hall effect are performed up to 64 T to characterize the scattering mechanisms governing charge transport in this correlated metal and to establish their connection to the Fermi surface. In films with low defect concentration (RRR > 60) and temperatures below 20 K, the resistivity follows a clear T² dependence, characteristic of Fermi-liquid behavior. Hall measurements reveal evidence for a weak hole contribution at intermediate temperatures 50 < T < 100 K and a dominant contribution of two electron-like carriers for T < 20 K. Furthermore, a large non-saturating linear magnetoresistance (LMR) is observed below 40 K. Its origin may be attributed to multi-carrier transport, anisotropic scattering, or impeded orbital motion. Quantum oscillations in both Hall- and magnetoresistance reveal a 50 T oscillation above 8 T and two high-frequency oscillations at 5000 T and 6000 T above 40 T, from which the effective masses, scattering times, and Dingle temperatures are extracted. It is shown that the T² resistivity and LMR are intrinsic features of high-quality CaVO₃ epitaxial films. A comparison with cubic SrVO₃ epitaxial films highlights the key distinctions between these two correlated perovskite oxide systems, most notably the reduced contribution from the hole-like Fermi surface in CaVO₃.
DOI: 10.18452/37397
Language: English
Open Access status: gold
OpenAlex ID: W7162107956
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