Journal
APL MATERIALS
Volume 9, Issue 10, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0060084
Keywords
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Funding
- Japan Science and Technology Agency Core Research for Evolutional Science and Technology (JST CREST) [JPMJCR16F1]
- JSPS [JP20K15168]
- Murata Science Foundation
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Sn2Nb2O7 thin films with a peculiar band structure were prepared by Ti-doping, which resulted in bandgap reduction and the formation of in-gap states, without injecting mobile carriers.
Sn2Nb2O7, a pyrochlore oxide, is expected to have a peculiar flat band structure that can be a source of intriguing physical properties. We have prepared Sn2Nb2O7 thin films by pulsed laser deposition on Y-stabilized ZrO2(111) substrates by finding a growth window at low growth temperature (similar to 450 degrees C) and higher laser fluence, possibly due to the rather high volatility of stannous oxide. By Ti-doping, the lattice constant shrinks due to the smaller Ti4+ ion compared with Nb5+. Optical measurements capture an absorption edge at similar to 2.6 eV originating from the transition from the Sn-5s and O-2p hybridized valence band to the Nb-4d conduction band, which is not observed in LiNbO3. Opposed to the expectation from the Burstein-Moss shift, Ti-doping results in reduction of the bandgap, indicating that the doping results in the formation of in-gap states and does not contribute to injecting mobile carriers.
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