期刊
ACS APPLIED ELECTRONIC MATERIALS
卷 2, 期 2, 页码 517-522出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.9b00751
关键词
LiTi2O4; thin films; superconductivity; transparency; band structures
资金
- World Premier Research Institute Initiative
- Japan Society for the Promotion of Science (JSPS) through its Funding Program for WorldLeading Innovation R&D on Science and Technology (FIRST Program)
- JSPS KAKENHI [JP17H05216, JP19H02596, JP19H04689, JP18H03876, JP18H05514]
- JST-PRESTO, Japan [JPMJPR17N6]
- JST-CREST program [JPMJCR1523]
We discuss the transparent conducting mechanism of LiTi2O4. In the Bardeen-Cooper-Schrieffer (BCS) framework, achieving a high superconducting transition temperature (T-c) requires high carrier density at the Fermi energy. This requirement suppresses the emergence of transparent superconductivity at high temperature because the high carrier density results in optical absorption in the visible region. In this paper, we here demonstrate transparent superconducting properties with Tc exceeding 13 K for epitaxial thin films of the spinel LiTi2O4(111). Although LiTi2O4 has a very high carrier density in excess of 1022 cm(-3), the film exhibits high transmittance in the visible region, which cannot be explained by the model for conventional transparent conductors. We show that a large effective mass plays a key role in the optical transparency in the visible region. These studies provide the material design principles for transparent conductors that would enable the development of highly efficient optoelectronic devices.
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