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We report a pressure ($P$) effect on CeCu$_2$(Si$_{0.98}$Ge$_{0.02}$)$_2$where an antiferromagnetic (AFM) order at $T_N \sim$ 0.75 K coexists withsuperconductivity below $T_c \sim$ 0.4 K\@. At pressures exceeding $P = 0.19$GPa, the AFM order is suppressed, which demonstrates that the sudden emergenceof AFM order due to the Ge doping is ascribed to the intrinsic latticeexpansion. The exotic superconductivity at $P = 0$ GPa is found to evolve intoa typical heavy-fermion one with a line-node gap above $P = 0.91$ GPa\@. Wehighlight that the anomalous enhancement in nuclear spin-lattice relaxationrate $1/T_1$ that follows a $T_1T$ = const. behavior well below $T_c$ at $P$ =0 GPa is characterized by the persistence of low-lying magnetic excitations,which may be inherent to the coexistent state of antiferromagnetism andsuperconductivity.Comment: 5 pages with 4 figures embedded in the text. To be published in J.  Phys. Soc. Jp

journal of the physical society of japan

Exotic Superconductivity in the Coexistent Phase of Antiferromagnetism and Superconductivity in CeCu2(Si0.98Ge0.02)2: A Cu-NQR Study under Hydrostatic Pressure