Magnetotransport of SrRuO₃Thin Film on SrTiO₃(001)

Abstract

The BiFeO 3 (BFO) thin film was deposited by pulsed-laser deposition on SrRuO 3 (SRO)-buffered (111) SrTiO 3 (STO) substrate. X-ray diffraction pattern reveals a well-grown epitaxial BFO thin film. Atomic force microscopy study indicates that the BFO film is rather dense with a smooth surface. The ellipsometric spectra of the STO substrate, the SRO buffer layer, and the BFO thin film were measured, respectively, in the photon energy range 1.55 to 5.40 eV. Following the dielectric functions of STO and SRO, the ones of BFO described by the Lorentz model are received by fitting the spectra data to a five-medium optical model consisting of a semi-infinite STO substrate/SRO layer/BFO film/surface roughness/air ambient structure. The thickness and the optical constants of the BFO film are obtained. Then a direct bandgap is calculated at 2.68 eV, which is believed to be influenced by near-bandgap transitions. Compared to BFO films on other substrates, the dependence of the bandgap for the BFO thin film on in-plane compressive strain from epitaxial structure is received. Moreover, the bandgap and the transition revealed by the Lorentz model also provide a ground for the assessment of the bandgap for BFO single crystals.

Magnetotransport and Hall effect studies of SrRuO3/SrTiO3superlattices

“…While the extrinsic picture predicts a resistivity dependence of R S [9] with a linear negative contribution from skew scattering and a positive quadratic contribution from side jump scattering [10], also a contribution from the Berry phase with a dependence on the crystal structure has been proposed [11]. Recently very good agreement with experimental data has been achieved by a combination of both effects [12].…”

Synthesis science of SrRuO3 and CaRuO3 epitaxial films with high residual resistivity ratios

“…[16][17][18] To date, the highest RRRs, (ρ 300 K /ρ 4 K ), reported for thin films are ∼80 for an 80 nm thick SrRuO 3 film and 39 for a 78 nm thick CaRuO 3 film, respectively. 7,73 For comparison, the highest RRRs, (ρ 300 K /ρ 4 K ), reported for single crystals of SrRuO 3 and CaRuO 3 are 162 and 38, respectively. 74,75 In general, the RRRs of perovskite ruthenate thin films have been low, likely due to the presence of ruthenium vacancies and more generally due to a lack of clear guiding principles for the growth of high-quality perovskite ruthenate thin films.…”

Magnetic, transport, and structural properties of SrRuO3 thin films

“…Here, their epitaxial growth on Si-compatible SrTiO 3 substrates is demonstrated by pulsed laser deposition. Detail on their initial, structural, magnetic, and magnetotransport characterisation is also provided.…”

“…The high-field magnetisation and magneto-transport in SRO have been investigated before, 3 however, no analysis is available of all accessible carrier types, besides some suggestions and indirect support for a two-band model of the electronic structure for SRO grown on LaAl 3 . 4 Therefore, here, resistivity and Hall data are analysed within two/three-carrier models, in the temperature region above T C (140-300 K), with an applied field of up to l 0 H 14 T. The interpretation suggested here is validated by highquality fits in a rather broad field and temperature interval, as illustrated in Fig.…”