Europhys. Lett., 61 (2) , pp. 254-260 (2003)
SR study of carbon-doped superconductorsK. Papagelis1, J. Arvanitidis1, K. Prassides1, A. Schenck2, T. Takenobu3 and Y. Iwasa3
1 School of Chemistry, Physics and Environmental Science, University of Sussex Brighton BN1 9QJ, UK
2 Institute for Particle Physics, ETH Zurich - CH-5232 Villigen PSI, Switzerland
3 Institute for Materials Research, Tohoku University - Sendai 980-8577, Japan and CREST, Japan Science and Technology Corporation - Kawaguchi 332-0012, Japan
(Received 24 July 2002; accepted 7 November 2002)
The evolution of the superconducting properties of the carbon-doped superconductors, 2-x x ( x= 0.02, 0.04, 0.06) have been investigated by the transverse-field muon spin rotation (TF- SR) technique. The low-temperature depolarisation rate, at 0.6 which is proportional to the second moment of the field distribution of the vortex lattice decreases monotonically with increasing electron doping and decreasing . In addition, the temperature dependence of has been analysed in terms of a two-gap model. The size of the two superconducting gaps decreases linearly as the carbon content increases.
76.75.+i - Muon spin rotation and relaxation.
74.70.Ad - Metals, alloys and binary compounds (including A15, Laves phases, etc.).
74.20.-z - Theories and models of superconducting state.
© EDP Sciences 2003