504 / 2019-03-19 09:09:03

SUPERCONDUCTIVITY in PRISTINE 2Ha-MoS2 at ULTRAHIGH PRESSURE

superconductivity,high pressure

全体主题 > High Pressure Physics and Materials Science

We extend pressure beyond the megabar range to seek after superconductivity in the 2Ha-MoS2 via electrical transport measurements. We found that superconductivity emerges with an onset critical temperature Tc 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 2Ha-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.