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Two-gap superconductivity in Ag1–xMo6S8 Chevrel phase

The superconducting properties of Ag1−xMo6S8 [x=0.08(1)] Chevrel phase [Tc=7.9(5) K] are studied on a sample compacted by spark plasma sintering. Both lower (Bc1=12(1) mT) and the upper [Bc2(0)≈7.4(9) T] critical magnetic fields are obtained from magnetization and electrical resistivity measurements for the first time. The analysis of the low-temperature electronic specific heat indicates Ag1−xMo6S8 to be a two band superconductor with the energy gaps Δ1=1.6 meV (95%) and Δ2=0.7 meV (5%). Theoretical DFT calculations reveal a much stronger electron–phonon coupling in the studied Chevrel phase compared to earlier reports. Similar to MgB2, the Fermi surface of studied Chevrel phase is formed by two hole-like and one electron-like bands.