Cu-NQR study of magnetism and superconductivity in Ce1+xCu2+ySi2 under pressure |
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Authors: | K Ishida Y Kawasaki T Mito C Thessieu G-q Zheng Y Kitaoka C Geibel F Steglich |
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Institution: | (1) Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan;(2) Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany |
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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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | CeCu2Si2 NQR pressure |
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