Exotic magnetic and superconducting phases in CeCU2Si2 close to magnetically ordered state: Cu-NQR study

Citation
Y. Kawasaki et al., Exotic magnetic and superconducting phases in CeCU2Si2 close to magnetically ordered state: Cu-NQR study, J MAGN MAGN, 226, 2001, pp. 374-375
Citations number
7
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
0304-8853 → ACNP
Volume
226
Year of publication
2001
Part
1
Pages
374 - 375
Database
ISI
SICI code
0304-8853(200105)226:<374:EMASPI>2.0.ZU;2-Z
Abstract
We report Cu-NQR results under pressure on heavy-fermion (HF) superconducto r CeCu2Si2 close to a magnetic phase, Ce0.99Cu2.02Si2 and CeCu2(Si0.98Ge0.0 2)(2). It is found that an application of a minute pressure exceeding 0.3 G Pa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce0.99CU2.02Si2, Correspondingly, anomalous supercondu cting (SC) characteristics evolve into conventional HF-SC ones with increas ing pressure. In the latter. the Ge substitution works as a negative chemic al pressure. CeCu2(Si0.98Ge0.02)(2) reveals a magnetic phase transition at T-N = 0.75 K followed by the SC phase transition at T-c similar to 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce0.99Cu2.02Si2 at P = 0 possesses a quantum critical character of both SC and magnetically ordered states. (C) 2001 Elsevier Science B.V. All righ ts reserved.