Effect of impurity scattering on the superconductivity of CeCu2Si2

Details Effect of impurity scattering on the superconductivity of CeCu2Si2 Effect of impurity scattering on the superconductivity of CeCu2Si2

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6..132y&link_type=abstract

New Journal of Physics, Volume 6, Issue 1, pp. 132 (2004).

Physics

2

Scientific paper

The archetypal heavy fermion superconductor CeCu2Si2 exhibits an unusual pressure temperature (P T) phase diagram, in which superconductivity survives over a broad region in pressure (>10 GPa) and the superconducting transition temperature Tc follows a complicated pressure dependence. To understand these unique properties, in this paper, we study a series of Ge-substituted single crystals CeCu2(Si1-xGex)2 (x = 0.01, 0.1 and 0.25). It is found that superconductivity is significantly weakened due to the elevated impurity scattering resulting from the partial Ge/Si substitution. For the sample with x = 0.01, a minimum of Tc(p) is revealed around 3 GPa. Upon further increasing x, the continuous superconducting region in the pure compounds breaks up into two disconnected superconducting domes. Superconductivity vanishes at x sime 0.25. These findings suggest that two different superconducting states, one magnetic and the other charge density fluctuations mediated, merge in CeCu2Si2.

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