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We report on the basis of Cu-NQR measurements that superconductivity (SC) andantiferromagnetism (AF) coexist on a microscopic level inCeCu_{2}(Si_{1-x}Ge_{x})_{2}, once a tiny amount of 1%Ge (x = 0.01) issubstituted for Si. This coexistence arises because Ge substitution expands theunit-cell volume in nearly homogeneous CeCu2Si2 where the SC coexists withslowly fluctuating magnetic waves. We propose that the underlying exotic phasesof SC and AF in either nearly homogeneous or slightly Ge substituted CeCu2Si2are accountable based on the SO(5) theory that unifies the SC and AF. Wesuggest that the mechanism of the SC and AF is common in CeCu2Si2.Comment: 7 pages with 6 figures embedded in the text. To be published in J.  Phys. Condens. Matter, 200

journal of physics. condensed matter

Coexistence of superconductivity and antiferromagnetism in the heavy-fermion superconductor CeCu2(Si1-xGex)2probed by means of Cu nuclear quadrupole resonance - a test case for the SO(5) theory