TY - JOUR
T1 - Gapless superconductivity and variation of {T_c} in the heavy-fermion system {CeCu_2Si_2}
AU - Bredl, C D
AU - Spille, H
AU - Rauchschwalbe, U
AU - Lieke, W
AU - Steglich, F
AU - Cordier, G
AU - Assmus, W
AU - Herrmann, M
AU - Aarts, J
N1 - International Conference on Magnetism, Toronto, 1983
PY - 1983
Y1 - 1983
N2 - Polycrystalline samples of CeCu2Si2 exhibit bulk superconductivity carried by "heavy fermions". While usually Tc [almost equal or equal to] (0.55 +/- 0.15) K, a few samples showed considerably lower transition temperatures (Tc [greater-or-equal, slanted] 0.11 K), which could, however, be raised to usual values by proper heat treatment. We found that lower Tc's are accompanied by both slightly reduced values of the spin-fluctuation temperature of the Ce3+ ions and the phenomenon of "gapless superconductivity". In agreement with recent results by Aliev et al. [5], a CeCu2Si2 single crystal did not become superconducting above 20 mK, but showed a 20% deficiency in Cu occupation.
AB - Polycrystalline samples of CeCu2Si2 exhibit bulk superconductivity carried by "heavy fermions". While usually Tc [almost equal or equal to] (0.55 +/- 0.15) K, a few samples showed considerably lower transition temperatures (Tc [greater-or-equal, slanted] 0.11 K), which could, however, be raised to usual values by proper heat treatment. We found that lower Tc's are accompanied by both slightly reduced values of the spin-fluctuation temperature of the Ce3+ ions and the phenomenon of "gapless superconductivity". In agreement with recent results by Aliev et al. [5], a CeCu2Si2 single crystal did not become superconducting above 20 mK, but showed a 20% deficiency in Cu occupation.
U2 - http://dx.doi.org/10.1016/0304-8853(83)90286-X
DO - http://dx.doi.org/10.1016/0304-8853(83)90286-X
M3 - Conference article in journal
VL - 31-34
SP - 373
EP - 376
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - Part 1
ER -