Abstract
We report a pressure (P) effect on CeCu2(Si 0.98Ge0.02)2 where an antiferromagnetic (AFM) order at TN ∼ 0.75 K coexists with superconductivity below T c ∼ 0.4 K. At pressures exceeding P = 0.19 GPa, the AFM order is suppressed, which demonstrates that the sudden emergence of AFM order due to the Ge doping is ascribed to the intrinsic lattice expansion. The exotic superconductivity at P = 0 GPa is found to evolve into a typical heavy-fermion one with a line-node gap above P = 0.91 GPa. We highlight that the anomalous enhancement in nuclear spin-lattice relaxation rate 1/T1 that follows a T1T = const. behavior well below Tc at P = 0 GPa is characterized by the persistence of low-lying magnetic excitations, which may be inherent to the coexistent state of antiferromagnetism and superconductivity.
Original language | English |
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Pages (from-to) | 194-197 |
Number of pages | 4 |
Journal | journal of the physical society of japan |
Volume | 73 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2004 |
Externally published | Yes |
Keywords
- Heavy-fermion superconductivity
- Impurity effect
- Nuclear magnetic resonance
- Pressure effect
- Quantum critical point
ASJC Scopus subject areas
- Physics and Astronomy(all)