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Gapless superconductivity and variation of Tc in the heavy-fermion system CeCu2Si2

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Citation

Bredl, C. D., Spille, H., Rauchschwalbe, U., Lieke, W., Steglich, F., Cordier, G., et al. (1983). Gapless superconductivity and variation of Tc in the heavy-fermion system CeCu2Si2. Journal of Magnetism and Magnetic Materials, 31-4(FEB), 373-376. doi:10.1016/0304-8853(83)90286-X.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-C29D-3
Abstract
Polycrystalline samples of CeCu2Si2 exhibit bulk superconductivity carried by “heavy fermions”. While usually Tc ≊ (0.55 ± 0.15) K, a few samples showed considerably lower transition temperatures (Tc ⩾ 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.