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The trigonal ${\alpha}$-HgS has a 3-fold helical chain structure, and is inform of a noncentrosymmetric $P3_121$ phase, known as the cinnabar phase.However, under pressure, the helical chains gradually approach and connect witheach other, finally reconstructing into a centrosymmetric NaCl structure at 21GPa. Superconductivity emerges just after this helical-nonhelical structuraltransition. The maximum critical temperature ($T_c$) reaches 11 K at 25.4 GPa,$T_c$ decreases with further compression, and is still 3.5 K at 44.8 GPa.Furthermore, the $T_c$-critical magnetic field ($B_{c2}$) relation exhibitsmulti-band features, with a $B_{c2}$ of 5.65 T at 0 K by two-band fitting.Raman spectra analysis demonstrates that phonon softening plays a key role instructural transition and the emergence of superconductivity. It is noted thatHgS is the first reported IIB group metal sulfide superconductor and the onlyNaCl-type metal sulfide superconductor with a $T_c$ above 10 K. This work willinspire the exploration of superconductivity in other chiral systems and willextend our understanding of the versatile behavior in such kinds of materials.

Emergence of superconductivity near 11 K by suppressing the 3-fold helical-chain structure in noncentrosymmetric HgS