Cu-NQR study of magnetism and superconductivity in Ce1+xCu2+ySi2 under pressure View Full Text


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Article Info

DATE

2000-11

AUTHORS

K. Ishida, Y. Kawasaki, T. Mito, C. Thessieu, G.-q. Zheng, Y. Kitaoka, C. Geibel, F. Steglich

ABSTRACT

In order to investigate magnetic properties in the vicinity of the magnetic to superconducting (SC) phase boundary, we have performed Cu-NQR measurements under hydrostatic pressure (P) on two off-stoichiometric Ce1+xCu2+ySi2 polycrystals: Ce0.99Cu2.02Si2 (denoted as Ce 0.99) exhibits the anomalous ground state so-called A phase dominated by critical magnetic correlations and Ce0.975Cu2Si2 (Ce 0.975) shows a static magnetic ordering at ambient P. With increasing P which enhances the Kondo temperature, the fraction of the A phase becomes markedly suppressed, and the SC fraction increases correspondingly, although Tc stays nearly constant in the measured pressure range, P≤14.4 kbar. This shows that the P-induced transition from the A to the SC phases is of a first-order type, without passing through a quantum (T→0) phase transition. However, no superconductivity has been attained in Ce 0.975 up to 19.4 kbar. It is considered that the P-induced superconductivity is sensitive to the sample quality. More... »

PAGES

193-204

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1012635716291

DOI

http://dx.doi.org/10.1023/a:1012635716291

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028872428


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