Enhanced metallic properties of SrRuO3 thin films via kinetically controlled pulsed laser epitaxy

Thompson, J.; Nichols, John; Lee, S.; Ryee, Siheon; Gruenewald, J. H.; Connell, John; Souri, Maryam; Johnson, Jared M.; Hwang, Jinwoo; Han, Myung Joon; Lee, H. N.; Kim, Dong Wook; Seo, S. S. A.

doi:10.1063/1.4964882

Cited by 18 publications

(18 citation statements)

References 34 publications

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“…The AF-M phase of LDA (which is absent in GGA phase diagram) is attributed to the smaller energy splitting between d xy and d yz , zx states near E F . Thus, for the case of SrTiO 3 32 , DyScO 3 32 or GdScO 3 14 substrate, we have two different predictions regarding the ground state property from two standard XC functionals. It therefore raises a serious question about the predictive power of the current first-principles method to describe the correlated oxide thin film and/or heterostructure for which the experimental information is often limited.…”

Section: Resultsmentioning

confidence: 96%

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Magnetic ground state of SrRuO3 thin film and applicability of standard first-principles approximations to metallic magnetism

Ryee

Han

2017

Sci Rep

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A systematic first-principles study has been performed to understand the magnetism of thin film SrRuO3 which lots of research efforts have been devoted to but no clear consensus has been reached about its ground state properties. The relative t 2g level difference, lattice distortion as well as the layer thickness play together in determining the spin order. In particular, it is important to understand the difference between two standard approximations, namely LDA and GGA, in describing this metallic magnetism. Landau free energy analysis and the magnetization-energy-ratio plot clearly show the different tendency of favoring the magnetic moment formation, and it is magnified when applied to the thin film limit where the experimental information is severely limited. As a result, LDA gives a qualitatively different prediction from GGA in the experimentally relevant region of strain whereas both approximations give reasonable results for the bulk phase. We discuss the origin of this difference and the applicability of standard methods to the correlated oxide and the metallic magnetic systems.

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Section: Resultsmentioning

confidence: 96%

“…In this paper we study the magnetism of SrRuO 3 (SRO113) thin film. First of all, it is an interesting system from both fundamental science and application point of view [13][14][15][16][17][18][19][20][21][22][23][24] . Its possible applications, for example, to the bottom electrode and field-effect devices have been discussed 13 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic ground state of SrRuO3 thin film and applicability of standard first-principles approximations to metallic magnetism

Ryee

Han

2017

Sci Rep

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“…The itinerant 4d ferromagnetic perovskite SrRuO3 has attracted strong attention because of the unique nature of its ferromagnetism, metallicity, chemical stability, and compatibility with other perovskite-structured oxides. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] It has been widely used in oxide electronics and spintronics as an epitaxial conducting layer. 8 Recently, interest in SrRuO3 has been further boosted by the observation of Weyl fermions 18 , 19 and the realization of two-dimensional ferromagnetism in electrically conducting layers of oneunit-cell thickness embedded in [(SrRuO3)1/(SrTiO3)n] heterostructures.…”

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confidence: 99%

“…One is poor crystallinity due to high impurity density and/or structural disorders, which is generally seen in low-quality samples. 8,11,12,30,31 The other one is Ru vacancies, which is rather specific to SrRuO3. 8,11 It is therefore required to distinguish between these two possibilities in order to improve the quality of SrRuO3 samples.…”

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confidence: 99%

Structural and transport properties of highly Ru-deficient SrRu0.7O3 thin films prepared by molecular beam epitaxy: Comparison with stoichiometric SrRuO3

et al. 2021

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We investigate structural and transport properties of highly Ru-deficient SrRu0.7O3 thin films prepared by molecular beam epitaxy on (001) SrTiO3 substrates. To distinguish the influence of the two types of disorders in the films-Ru vacancies within lattices and disorders near the interface-SrRu0.7O3 thin films with various thicknesses (t = 1-60 nm) were prepared. It was found that the influence of the former dominates the electrical and magnetic properties when t ≥ 5-10 nm, while that of the latter does when t ≤ 5-10 nm. Structural characterizations revealed that the crystallinity, in terms of the Sr and O sublattices, of SrRu0.7O3 thin films, is as high as that of the ultrahigh-quality SrRuO3 ones. The Curie temperature (TC) analysis elucidated that SrRu0.7O3 (TC ≈ 140 K) is a material distinct from SrRuO3 (TC ≈ 150 K). Despite the large Ru deficiency (~30%), the SrRu0.7O3 films showed metallic conduction when t ≥ 5 nm. In high-field magnetoresistance measurements, the fascinating phenomenon of Weyl fermion transport was not observed for the SrRu0.7O3 thin films irrespective of thickness, which is in contrast to the stoichiometric SrRuO3 films. The (magneto)transport properties suggest that a picture of carrier scattering due to the Ru vacancies is appropriate for SrRu0.7O3, and also that proper stoichiometry control is a prerequisite to utilizing the full potential of SrRuO3 as a magnetic Weyl semimetal and two-dimensional spin-polarized system. Nevertheless, the large tolerance in Ru composition (~30 %) to metallic conduction is advantageous for some practical applications where SrRu1-xO3 is exploited as an epitaxial conducting layer.

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“…The itinerant ferromagnetic perovskite SrRuO3 has been widely used in oxide electronics and spintronics as an epitaxial conducting layer owing to the unique nature of its ferromagnetism, metallicity, compatibility with other perovskite-structured oxides, and chemical stability. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] The reasons for renewed interest in SrRuO3 are twofold. One is the observation of quantum transport of Weyl fermions in SrRuO3, 18 such as chiralanomaly-induced negative magnetoresistance (MR), unsaturated linear positive MR, π Berry phase along cyclotron orbits, light cyclotron masses, and high quantum mobility of about 10000 cm 2 /Vs.…”

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confidence: 99%

Thickness-dependent quantum transport of Weyl fermions in ultra-high-quality SrRuO3 films

Kaneta‐Takada

Wakabayashi

Krockenberger

et al. 2021

Applied Physics Letters

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The recent observation of Weyl fermions in the itinerant 4d ferromagnetic perovskite SrRuO3 points to this material being a good platform for exploring novel physics related to a pair of Weyl nodes in epitaxial heterostructures. In this letter, we report the thickness-dependent magnetotransport properties of ultra-high-quality epitaxial SrRuO3 films grown under optimized conditions on SrTiO3 substrates. Signatures of Weyl fermion transport, i.e., unsaturated linear positive magnetoresistance accompanied by a quantum oscillation having a π Berry phase, were observed in films with thicknesses as small as 10 nm. Residual resistivity increased with decreasing film thickness, indicating disorder near the interface between SrRuO3 and the SrTiO3 substrate. Since this disorder affects the magnetic and electrical properties of the films, the Curie temperature decreases and the coercive field increases with decreasing thickness. Thickness-dependent magnetotransport measurements revealed that the threshold residual resistivity ratio (RRR) to observe Weyl fermion transport is 21. These results provide guidelines for realizing quantum transport of Weyl fermions in SrRuO3 near heterointerfaces.

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Enhanced metallic properties of SrRuO3 thin films via kinetically controlled pulsed laser epitaxy

Cited by 18 publications

References 34 publications

Magnetic ground state of SrRuO3 thin film and applicability of standard first-principles approximations to metallic magnetism

Magnetic ground state of SrRuO3 thin film and applicability of standard first-principles approximations to metallic magnetism

Structural and transport properties of highly Ru-deficient SrRu0.7O3 thin films prepared by molecular beam epitaxy: Comparison with stoichiometric SrRuO3

Thickness-dependent quantum transport of Weyl fermions in ultra-high-quality SrRuO3 films

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