muSR study of carbon-doped MgB2 superconductors

Abstract

The evolution of the superconducting properties of the carbon-doped MgB2 superconductors, MgB(2-x)Cx (x= 0.02, 0.04, 0.06) have been investigated by the transverse-field muon spin rotation (TF-muSR) technique. The low-temperature depolarisation rate, sigma(0) at 0.6 T which is proportional to the second moment of the field distribution of the vortex lattice decreases monotonically with increasing electron doping and decreasing Tc. In addition, the temperature dependence of sigma(T) has been analysed in terms of a two-gap model. The size of the two superconducting gaps decreases linearly as the carbon content increases, while the doping effect is more pronounced for the smaller gap related to the 3D pi-sheets of the Fermi surface.

7 pages, 2 Figures, 1 Table, Europhys. Lett. in press

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Cited by in corpus (9)

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• Temperature dependence of lower critical field Hc1(T) shows nodeless superconductivity in FeSe
• Thermodynamics of Two - Band Superconductors: The Case of MgB${}_2$
• Carbon-substitution dependent multiple superconducting gap of MgB${}_2$: a "sub-meV" resolution photoemission study
• Effect of two gaps on the flux lattice internal field distribution: evidence of two length scales from muSR in Mg1-xAlxB2
• Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy
• Small Fermi energy, zero point fluctuations and nonadiabaticity in MgB${}_2$
• Influence of carbon substitution on the heat transport in single crystalline MgB2
• ${}^{11}$B NMR study of pure and lightly carbon doped MgB${}_2$ superconductors