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Coexistence of superconductivity and antiferromagnetism in the heavy-fermion superconductor CeCu<sub>2</sub>(Si<sub>1-<i>x</i></sub>Ge<sub><i>x</i></sub>)<sub>2</sub>probed by means of Cu nuclear quadrupole resonance - a test case for the SO(5) theory
We report on the basis of Cu-NQR measurements that superconductivity (SC) and antiferromagnetism (AF) coexist on a microscopic level in CeCu_{2}(Si_{1-x}Ge_{x})_{2}, once a tiny amount of 1%Ge (x = 0.01) is substituted for Si. This coexistence arises because Ge substitution expands the unit-cell volume in nearly homogeneous CeCu2Si2 where the …