Anticorrelation between polar lattice instability and superconductivity in the Weyl semimetal candidate MoTe2

Abstract

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 Tc at around the critical pressure where the polar structure transition disappears. From the heat capacity and thermopower measurements, we ascribe the significant enhancement of Tc 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 Tc as compared with the chemical pressure, which emphasizes the importance of the interlayer coupling on the structural and superconducting instability in MoTe2.

arXiv comment5 pages, 4 figures

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• Topological phase transition between distinctWeyl semimetal states in MoTe2
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• Superconducting properties of MoTe${}_2$ from the $abinitio$ anisotropic Migdal-Eliashberg theory
• Negative thermal expansion near two structural quantum phase transitions
• Emergent superconductivity by Re doping in type -II Weyl semimetal NiTe2
• Evolution of the structural transition in Mo${}_{1-x}$W${}_x$Te${}_2$
• Pressure-induced creation and annihilation of Weyl points in Td- and 1T"-Mo0.5W0.5Te2
• Superconductivity in doped Weyl semimetal Mo${}_{0.9}$Ir${}_{0.1}$Te${}_2$ with broken inversion symmetry
• Enhancement of superconductivity on the verge of a structural instability in isovalently doped $\beta$-ThRh${}_{1-x}$Ir${}_x$Ge
• Drastic enhancement of the superconducting temperature in type-II Weyl semimetal candidate MoTe${}_2$ via biaxial strain
• Pressure induced topological quantum phase transition in Weyl semimetal T_d-MoTe_2
• Superconducting pairing symmetry in MoTe${}_2$
• Observation of converse flexoelectric effect in topological semimetals
• Enhanced thermopower in a magnetic semiconductor EuTe4 with multiple charge-density-wave instabilities/
• Suppression of both superconductivity and structural transition in hole-doped MoTe${}_2$ induced by Ta substitution
• Point-contact Andreev reflection spectroscopy of layered superconductors with device-integrated diamond anvil cells
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