Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-12-09
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages with 6 figures embedded in the text. To be published in J. Phys. Condens. Matter, 2001
Scientific paper
10.1088/0953-8984/13/4/103
We report on the basis of Cu-NQR measurements that superconductivity (SC) and antiferromagnetism (AF) coexist on a microscopic level in CeCu_{2}(Si_{1-x}Ge_{x})_{2}, once a tiny amount of 1%Ge (x = 0.01) is substituted for Si. This coexistence arises because Ge substitution expands the unit-cell volume in nearly homogeneous CeCu2Si2 where the SC coexists with slowly fluctuating magnetic waves. We propose that the underlying exotic phases of SC and AF in either nearly homogeneous or slightly Ge substituted CeCu2Si2 are accountable based on the SO(5) theory that unifies the SC and AF. We suggest that the mechanism of the SC and AF is common in CeCu2Si2.
Geibel Ch.
Ishida Keiichi
Kawasaki Yasuhiro
Kitaoka Yoshio
Steglich Frank
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