Abstract
We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu 2Si 2 close to a magnetic phase, Ce 0.99Cu 2.02Si 2 and CeCu 2(Si 0.98Ge 0.02) 2. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure ( P=0) in Ce 0.99Cu 2.02Si 2. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu 2(Si 0.98Ge 0.02) 2 reveals a magnetic phase transition at T N=0.75 K followed by the SC phase transition at T c∼0.4 K at P=0. It is suggested experimentally that the magnetic fluctuations seen in Ce 0.99Cu 2.02Si 2 at P=0 possesses a quantum critical character of both SC and magnetically ordered states.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
