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Journal Article

Two-gap superconductivity in Ag1-xMo6S8 Chevrel phase

MPS-Authors
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Feig,  Manuel
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bobnar,  Matej
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Veremchuk,  Igor
Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Burkhardt,  Ulrich
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Leithe-Jasper,  Andreas
Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Feig, M., Bobnar, M., Veremchuk, I., Hennig, C., Burkhardt, U., Starke, R., et al. (2017). Two-gap superconductivity in Ag1-xMo6S8 Chevrel phase. Journal of Physics: Condensed Matter, 29(49): 495603, pp. 1-9. doi:10.1088/1361-648X/aa97fd.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002E-9804-8
Abstract
The superconducting properties of Ag1-xMo6S8 [x = 0.08(1)] Chevrel phase [T-c = 7.9(5) K] are studied on a sample compacted by spark plasma sintering. Both lower (B-c1 = 12(1) mT) and the upper [B-c2(0) approximate to 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 Delta(1) = 1.6 meV (95%) and Delta(2) = 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.