Manipulating superconductivity of 1T-TiTe2 by high pressure

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 5; no. 17; pp. 4167 - 4173
• Main Authors: Xiao, R. C, Lu, W. J, Shao, D. F, Li, J. Y, Wei, M. J, Lv, H. Y, Tong, P, Zhu, X. B, Sun, Y. P
• Format: Journal Article
• Language: English
• Published: 07.05.2017
• Subjects: Aluminum; Density of states; Hydrostatic pressure; Liquid helium; Softening; Superconductivity; Topology; Transition metals
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c7tc00209b

Superconductivity of transition metal dichalcogenide 1 T -TiTe 2 under high pressure was investigated by first-principles calculations. Our results show that the superconductivity of 1 T -TiTe 2 exhibits very different behavior under hydrostatic and uniaxial pressure. The hydrostatic pressure is harmful to the superconductivity, while the uniaxial pressure is beneficial to the superconductivity. The superconducting transition temperature T C at ambient pressure is 0.73 K, and it reduces monotonously under the hydrostatic pressure to 0.32 K at 30 GPa, while T C increases dramatically under the uniaxial pressure along the c axis. The established T C of 6.34 K under the uniaxial pressure of 17 GPa, below which the structural stability is maintained, is above the liquid helium temperature of 4.2 K. The increase of the density of states at the Fermi level, the red-shift of the phonon density of states/Eliashberg spectral function F ( ω )/ α 2 F ( ω ), and the softening of the acoustic modes with pressure are considered as the main reasons that lead to the enhanced superconductivity under uniaxial pressure. In view of the previously predicted topological phase transitions of 1 T -TiTe 2 under the uniaxial pressure (Q. Zhang et al., Phys. Rev. B: Condens. Matter Mater. Phys. , 2013, 88 , 155317), we consider 1 T -TiTe 2 as a possible candidate in transition metal chalcogenides for exploring topological superconductivity. Superconductivity of transition metal dichalcogenide 1 T -TiTe 2 under high pressure was investigated by first-principles calculations.