Origin of insulating and nonferromagnetic 
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 monolayers

Ali, Zeeshan; Wang, Zhen; O’Hara, Andrew; Saghayezhian, Mohammad; Shin, Donghan; Zhu, Yimei; Pantelides, Sokrates T.; Zhang, Jiandi

doi:10.1103/physrevb.105.054429

Cited by 14 publications

(5 citation statements)

References 65 publications

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“…The structure of the RuO 6 octahedron in ruthenium oxides is dominant for physical properties. [ 13,42–45 ] This study clarifies the changes in the structure of the RuO 6 octahedron contained in CRO at the interface above the substrate. The structure and composition of the samples were investigated via atomic‐solution inverse contrast annular bright‐field (ABF)/high‐angle annular dark field (HAADF)‐STEM imaging.…”

Section: Resultssupporting

confidence: 57%

“…Ca and Ru are visible in the HAADF image, whereas O, a lighter element, is visible using ABF. [ 43–45 ] The periodic arrangement of Nd, Ga, Ca, and Ru can be seen in the vicinity of the interface from HAADF imaging in Figure 5c,e and Figure S16 (Supporting Information). The projected angle θ (defined in Figure 5f inset) between the Ru and O atoms in Figure 5d was measured and plotted at the Ru and Ga sites above and directly below the interface indicated by the dotted line, respectively (Figure 5f).…”

Section: Resultsmentioning

confidence: 99%

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Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Sakoda

Kouda

Shinya

et al. 2023

Adv Elect Materials

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In a previous report, 25 Å periodic metal–insulator transitions dependent on the thickness of CaRuO3 ultrathin films were discovered. Compared to the conventional size effect caused by quantum wells, the rate of change is a few billions of times greater at low temperatures. Although the electrical resistivity of insulating state differs by several orders with the film thickness, the enhancement trigger was not clarified. In this study, it is clarified that the magnitude of the extraordinary size effect varies with the element supply ratio owing to precise control of the molecular beam rates of calcium and ruthenium. The supplied calcium over ruthenium ratio Ca/Ru = 1.2–1.8 during CaRuO3 deposition results in a stoichiometric ratio of Ca:Ru = 1:1 on the CaRuO3 films. Calcium‐rich elemental supply conditions result in large electrical resistivity variations. Electrical resistivity oscillations with periods of T = 23.4 and 26.3 Å are observed for the growth conditions of Ca/Ru = 1.2 and 1.6, respectively. Furthermore, a flat surface with a roughness of ≈2 Å is required to observe the size effect. Thus, the insulation of an extraordinary size effect is enhanced in CaRuO3 ultrathin films grown under the condition of calcium‐rich Ca/Ru ≈ 1.6.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Sakoda

Kouda

Shinya

et al. 2023

Adv Elect Materials

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“…[27][28][29] Efforts in getting rid of such an either insulating or nonferromagnetic dead layer are highly challenging, which is dependent on the elegant growth control of stoichiometry of SRO, usually turning out the debated experimental results. [30][31][32][33] In recent experiments, the giant photoresponse has been observed in LaAlO 3 /STO interface via inserting a monolayer Mott SRO. [34] These results suggest that ultrathin Mott SRO grown on the STO substrate may provide an ideal platform to not only eliminate the dead layer, but also investigate phase transition through the facile light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Light‐Induced Mott‐Insulator‐to‐Metal Phase Transition in Ultrathin Intermediate‐Spin Ferromagnetic Perovskite Ruthenates

Liu

Niu

et al. 2023

Advanced Materials

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Light control of emergent quantum phenomena is a widely used external stimulus for quantum materials. Generally, perovskite strontium ruthenate SrRuO3 has an itinerant ferromagnetism with a low‐spin state. However, the phase of intermediate‐spin (IS) ferromagnetic metallic state has never been seen. Here, by means of UV‐light irradiation, a photocarrier‐doping‐induced Mott‐insulator‐to‐metal phase transition is shown in a few atomic layers of perovskite IS ferromagnetic SrRuO3−δ. This new metastable IS metallic phase can be reversibly regulated due to the convenient photocharge transfer from SrTiO3 substrates to SrRuO3−δ ultrathin films. These dynamical mean‐field theory calculations further verify such photoinduced electronic phase transformation, owing to oxygen vacancies and orbital reconstruction. The optical manipulation of charge‐transfer finesse is an alternative pathway toward discovering novel metastable phases in strongly correlated systems and facilitates potential light‐controlled device applications in optoelectronics and spintronics.

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“…In particular, MO 6 octahedron rotation significantly alters the electronic structure and may induce phase transitions, often accompanying changes in physical properties. A prime example is a well-known ferromagnetic metallic TMO perovskite SRO for which various characteristics appear with RuO 6 octahedral rotations; a large octahedral rotation angle favors an insulating antiferromagnetic phase whereas a small octahedral rotation prefers a metallic ground state with ferromagnetism [9][10][11]. As such, numerous attempts to control the MO 6 octahedron angle and characteristics of TMO systems have been reported [10,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Evolution of electronic band reconstruction in thickness-controlled perovskite SrRuO$_3$ thin films

Sohn¹,

Kim²

2022

Preprint

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Transition metal perovskite oxides display a variety of emergent phenomena which are tunable by tailoring the oxygen octahedral rotation. SrRuO3, a ferromagnetic perovskite oxide, is well-known to have various atomic structures and octahedral rotations when grown as thin films. However, how the electronic structure changes with the film thickness has been hardly studied. Here, by using angle-resolved photoemission spectroscopy and electron diffraction techniques, we study the electronic structure of SrRuO3 thin films as a function of the film thickness. Different reconstructed electronic structures and spectral weights are observed for films with various thicknesses. We suggest that octahedral rotations on the surface can be qualitatively estimated via comparison of intensities of different bands. Our observation and methodology shed light on how structural variation and transition may be understood in terms of photoemission spectroscopy data.

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Origin of insulating and nonferromagnetic SrRuO3 monolayers

Cited by 14 publications

References 65 publications

Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Light‐Induced Mott‐Insulator‐to‐Metal Phase Transition in Ultrathin Intermediate‐Spin Ferromagnetic Perovskite Ruthenates

Evolution of electronic band reconstruction in thickness-controlled perovskite SrRuO$_3$ thin films

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Origin of insulating and nonferromagnetic SrRuO3 monolayers

Cited by 14 publications

References 65 publications

Enhancement of Extraordinary Size Effect on CaRuO3 Ultrathin Films

Enhancement of Extraordinary Size Effect on CaRuO3 Ultrathin Films

Light‐Induced Mott‐Insulator‐to‐Metal Phase Transition in Ultrathin Intermediate‐Spin Ferromagnetic Perovskite Ruthenates

Evolution of electronic band reconstruction in thickness-controlled perovskite SrRuO$_3$ thin films

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Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films

Enhancement of Extraordinary Size Effect on CaRuO₃ Ultrathin Films