期刊
PHYSICAL REVIEW B
卷 95, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.100501
关键词
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资金
- JSPS, KAKENHI [16K17736]
- JST PRESTO
- Asahi Glass Foundation
- Grant for Basic Science Research Projects of the Sumitomo Foundation
- Grants-in-Aid for Scientific Research [16K17736, 15H02111, 15K13332, 15H03685, 16H01071, 16H06015] Funding Source: KAKEN
The relation between the polar structural instability and superconductivity in a Weyl semimetal candidate MoTe2 has been clarified by finely controlled physical and chemical pressure. The physical pressure as well as the chemical pressure, i.e., the Se substitution for Te, enhances the superconducting transition temperature T-c at around the critical pressure where the polar structure transition disappears. From the heat capacity and thermopower measurements, we ascribe the significant enhancement of T-c at the critical pressure to a subtle modification of the phonon dispersion or the semimetallic band structure upon the polar-to-nonpolar transition. On the other hand, the physical pressure, which strongly reduces the interlayer distance, is more effective on the suppression of the polar structural transition and the enhancement of T-c as compared with the chemical pressure, which emphasizes the importance of the interlayer coupling on the structural and superconducting instability in MoTe2.
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