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Rocksalt-type heavy rare earth monoxides TbO, DyO, and ErO exhibiting metallic electronic states and ferromagnetism.
Dalton Trans
December 2024
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
Solid-phase rare earth monoxides have been recently synthesized thin film epitaxy. However, it has been difficult to synthesize heavy rare earth monoxides owing to their severe chemical instability. In this study, rocksalt-type heavy rare earth monoxides REOs (RE = Tb, Dy, Er) were synthesized for the first time, as single-phase epitaxial thin films.
View Article and Find Full Text PDFRoom-Temperature Possible Current-Induced Transition in CaRuO Thin Films Grown Through Intercalation-Like Cation Diffusion in the ABO Ruddlesden-Popper Structure.
Small Methods
December 2024
MDX Research Center for Element Strategy, International Research Frontiers Initiative, Tokyo Institute of Technology, Yokohama, 226-8501, Japan.
Cation deficiency tuning is a central issue in thin-film epitaxy of functional metal oxides, as it is typically more difficult than anion deficiency tuning, as anions can be readily supplied from gas sources. Here, highly effective internal deficiency compensation of Ru cations is demonstrated for CaRuO epitaxial films based on diffusive transfer of metal cations in the ABO Ruddlesden-Popper lattice from solid-phase cation sources. Through detailed structural characterization of CaRuO/LaAlO (001) thin films grown with external cation sources by solid-phase epitaxy, the occurrence of intercalation-like, interstitial diffusion of La cations (from the substrates) in the ABO structure is revealed, and that of Ru cations is also suggested.
View Article and Find Full Text PDFAb Initio Molecular Dynamics Insight to Structural Phase Transition and Thermal Decomposition of InN.
Int J Mol Sci
July 2024
Institute of High Pressure Physics, Polish Academy of Sciences, 29/37, Sokolowska Street, 01-142 Warsaw, Poland.
Extensive ab initio density functional theory molecular dynamics calculations were used to evaluate stability conditions for relevant phases of InN. In particular, the p-T conditions of the thermal decomposition of InN and pressure-induced wurtzite-rocksalt solid-solid phase transition were established. The comparison of the simulation results with the available experimental data allowed for a critical evaluation of the capabilities and limitations of the proposed simulation method.
View Article and Find Full Text PDFOptical and electronic functionality arising from controlled defect formation in nanoscale complex oxide lateral epitaxy.
Sci Adv
July 2024
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
Epitaxial crystallization of complex oxides provides the means to create materials with precisely selected composition, strain, and orientation, thereby controlling their functionalities. Extending this control to nanoscale three-dimensional geometries can be accomplished via a three-dimensional analog of oxide solid-phase epitaxy, lateral epitaxial crystallization. The orientation of crystals within laterally crystallized SrTiO systematically changes from the orientation of the SrTiO substrate.
View Article and Find Full Text PDFLight-emitting diodes with Ge(Si) nanoislands embedded in photonic crystals.
Nanotechnology
February 2024
Institute for Physics of Microstructures of the Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia.
Room temperature lateral p-i-nlight-emitting diodes (LEDs) with photonic crystals embedded in the i-region were fabricated on structures with Ge(Si) self-assembled islands and their optical properties were investigated. The use of preliminary amorphization and solid phase epitaxy of the implanted pand ncontact regions made it possible to reduce the impurity activation temperature from 800 °С-1100 °С to 600 °С, which corresponds to the growth temperature of Ge(Si) islands. This resulted in a significant reduction of the detrimental effect of the high-temperature annealing used for diode formation on the intensity and spectral position of the luminescence signal from the islands.
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