Formation of ilmenite-type single-crystalline MgTiO3 thin films by pulsed-laser deposition
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- Masamichi Negishi
- Institute for Materials Research, Tohoku University 1 , Sendai 980-8577, Japan
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- Kohei Fujiwara
- Institute for Materials Research, Tohoku University 1 , Sendai 980-8577, Japan
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- Atsushi Tsukazaki
- Institute for Materials Research, Tohoku University 1 , Sendai 980-8577, Japan
抄録
<jats:p>Ilmenite structure is a good playground to explore magnetism in honeycomb lattices owing to the existence of an intriguing variety of magnetism in 3d transition metal compounds. Because of the absence of magnetic ions, ilmenite-type MgTiO3 is a promising candidate for d0 transparent insulators to reveal general features of TiO6 honeycomb layers. In this study, we found an optimum growth condition to synthesize ilmenite-type single-crystalline MgTiO3 thin films on Al2O3(0001) substrates by pulsed-laser deposition. By increasing oxygen pressure from roughly 10−6 to 10−1 Torr, we obtained (0001)-oriented MgTiO3 thin films with suppression of segregation of a Mg2TiO4 phase. On the triangular lattice of Al2O3, twin-domain formation is suppressed with decreasing deposition rate, resulting in the synthesis of single-crystalline MgTiO3 thin films. The bandgap of the MgTiO3 film was evaluated to be about 4.4 eV by optical absorption spectra, which implies d0 transparent insulator.</jats:p>
収録刊行物
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- AIP Advances
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AIP Advances 11 (12), 2021-12-01
AIP Publishing