Superconductivity in Pristine 2Ha-MoS2 at Ultrahigh Pressure

Chi, Z.; Chen, X.; Yen, F.; Peng, F.; Zhou, Y.; Zhu, J.; Zhang, Y.; Liu, X.; Lin, C.; Chu, S.; Li, Y.; Zhao, J.; Kagayama, T.; Ma, Y.; Yang, Z.

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Superconductivity in Pristine 2H_a-MoS₂ at Ultrahigh Pressure

MPS-Authors

Zhang, Y.
Max Planck Society;

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Liu, X.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Yang, Z.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Chi, Z., Chen, X., Yen, F., Peng, F., Zhou, Y., Zhu, J., et al. (2018). Superconductivity in Pristine 2H_a-MoS₂ at Ultrahigh Pressure. Physical Review Letters, 120(3): 037002.

Cite as: https://hdl.handle.net/21.11116/0000-000E-E010-2

Abstract

As a follow-up of our previous work on pressure-induced metallization of the 2H(c)-MoS2 [Chi et al., Phys. Rev. Lett. 113, 036802 (2014)], here we extend pressure beyond the megabar range to seek after superconductivity via electrical transport measurements. We found that superconductivity emerges in the 2H(a)-MoS2 with an onset critical temperature T-c of ca. 3 K at ca. 90 GPa. Upon further increasing the pressure, Tc is rapidly enhanced beyond 10 K and stabilized at ca. 12 K over a wide pressure range up to 220 GPa. Synchrotron x-ray diffraction measurements evidenced no further structural phase transition, decomposition, and amorphization up to 155 GPa, implying an intrinsic superconductivity in the 2H(a)-MoS2. DFT calculations suggest that the emergence of pressure-induced superconductivity is intimately linked to the emergence of a new flat Fermi pocket in the electronic structure. Our finding represents an alternative strategy for achieving superconductivity in 2H-MoS2 in addition to chemical intercalation and electrostatic gating.