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We have shown that the value of Coulomb pseudopotential ($\\mu^{\\star}$) for ${\\rm H_{5}S_{2}}$ ($\\left[T_{C}\\right]_{\\rm exp}=36$~K and $p=112$~GPa) is anomalously high. The numerical results give the limitation from below to $\\mu^{\\star}$ that is equal to $0.402$ ($\\mu^{\\star}=0.589$, if we consider the first order vertex corrections to the electron-phonon interaction). 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Wrona, Joanna K. Kalaga, Ma{\\l}gorzata Kostrzewa, Rados{\\l}aw Szcz\\k{e}\\'sniak","submitted_at":"2018-04-25T19:15:33Z","abstract_excerpt":"The ${\\rm H_{5}S_{2}}$ and ${\\rm H_{2}S}$ compounds are the two candidates for the low-temperature phase of compressed sulfur-hydrogen system. We have shown that the value of Coulomb pseudopotential ($\\mu^{\\star}$) for ${\\rm H_{5}S_{2}}$ ($\\left[T_{C}\\right]_{\\rm exp}=36$~K and $p=112$~GPa) is anomalously high. The numerical results give the limitation from below to $\\mu^{\\star}$ that is equal to $0.402$ ($\\mu^{\\star}=0.589$, if we consider the first order vertex corrections to the electron-phonon interaction). 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