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Node-like excitations in superconducting PbMo6S8 probed by scanning tunneling spectroscopy

Potel, M.
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Published in Physical review. B, Condensed matter and materials physics. 2007, vol. 75, no. 10, 104501
Abstract We present a scanning tunneling spectroscopy study on the Chevrel phase PbMo6S8, an extreme type-II superconductor with a coherence length only slightly larger than in high-Tc cuprates. Tunneling spectra measured on atomically flat terraces are spatially homogeneous and show well-defined coherence peaks. The low-energy spectral weight, the zero bias conductance, and the temperature dependence of the gap are incompatible with a conventional isotropic s-wave interpretation, revealing the presence of low-energy excitations in the superconducting state. We show that our data are consistent with the presence of nodes in the superconducting gap.
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DUBOIS, Cédric et al. Node-like excitations in superconducting PbMo6S8 probed by scanning tunneling spectroscopy. In: Physical Review. B, Condensed Matter, 2007, vol. 75, n° 10, p. 104501. doi: 10.1103/PhysRevB.75.104501 https://archive-ouverte.unige.ch/unige:26789

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Deposited on : 2013-03-13

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