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Pair breaking in the heavy-fermion superconductors Ce1−xMxCu2.2Si2 and U1−xMxBe13 (M: Th, La, Y and Gd)

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Citation

Ahlheim, U., Winkelmann, M., van Aken, P., Bredl, C. D., Steglich, F., & Stewart, G. R. (1988). Pair breaking in the heavy-fermion superconductors Ce1−xMxCu2.2Si2 and U1−xMxBe13 (M: Th, La, Y and Gd). Journal of Magnetism and Magnetic Materials, 76-7, 520-522. doi:10.1016/0304-8853(88)90473-8.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D4BF-E
Abstract
We report measurements of Tc and ΔC for Ce1−xMxCu2.22Si2 (M = La, Y, Gd) and U1−xMxBe13 (M: Th, La, Y). “Diamagnetic” pair breaking by nonmagnetic dopants is observed which implies an anisotropic nature of both the superconducting order parameter and the impurity-scattering mechanism. Gd impurities in CeCu2.2Si2 give rise to additional “paramagnetic” pair breaking.