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Superconductivity and charge density wave formation in TlxV6S8

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Miclea,  C. F.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Miclea, C. F., Hochheimer, H. D., Martin, B., Miclea, C., & Ohtani, T. (2013). Superconductivity and charge density wave formation in TlxV6S8. New Journal of Physics, 15: 083008, pp. 083008-1-083008-15. doi:10.1088/1367-2630/15/8/083008.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1E82-B
Abstract
We report on specific heat and resistivity measurements under hydrostatic pressure on the quasi-one dimensional metal TlxV6S8. We studied the interplay between the low temperature superconducting (SC) ground state and a high temperature charge density wave (CDW) instability. We observed a clear dependency of the physical properties of TlxV6S8 on the Tl concentration x. The CDW anomaly is present in all investigated samples that are strongly enhanced at half Tl filling, x = 0.47. This is also the only composition for which no signature of superconductivity is observed. The specific heat results regarding the SC phase in Tl0.63V6S8 suggest that this compound is a highly anisotropic, weak coupling superconductor. Pressure suppresses both SC and CDW transitions to lower temperatures. Nevertheless, as the CDW gap is closed at a critical pressure p(c), the increase in the density of states leads to a small enhancement of T-c suggesting that SC and CDW compete for parts of the Fermi-surface.