Unpaired electrons in the heavy-fermion superconductor CeCoIn5.
Unpaired electrons in the heavy-fermion superconductor CeCoIn5.
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DOI：
10.1103/physrevlett.95.067002
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发表时间：
2005-03
影响因子：
8.6
通讯作者：
M. Tanatar;J. Paglione;S. Nakatsuji;D. Hawthorn;E. Boaknin;R. W. Hill;F. Ronning;M. Sutherland;L. Taillefer;C. Petrovic;P. Canfield;Z. Fisk
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文献类型：
--
作者：
M. Tanatar;J. Paglione;S. Nakatsuji;D. Hawthorn;E. Boaknin;R. W. Hill;F. Ronning;M. Sutherland;L. Taillefer;C. Petrovic;P. Canfield;Z. Fisk
测量了重费米子材料Ce（1-x）La（x）CoIn 5超导态的热导率和比热。随着杂质浓度x的增加，T（c）的抑制伴随着d波超导体预期的剩余电子比热的增加，但它与剩余电子热导率的降低平行发生。这种对比的行为揭示了非凝聚电子与结状准粒子共存的存在。一个极端的多带方案，提出了一个d-波超导间隙的费米表面的重电子片和轻，三维口袋的间隙可以忽略不计。
Thermal conductivity and specific heat were measured in the superconducting state of the heavy-fermion material Ce(1-x)La(x)CoIn5. With increasing impurity concentration x, the suppression of T(c) is accompanied by the increase in residual electronic specific heat expected of a d-wave superconductor, but it occurs in parallel with a decrease in residual electronic thermal conductivity. This contrasting behavior reveals the presence of uncondensed electrons coexisting with nodal quasiparticles. An extreme multiband scenario is proposed, with a d-wave superconducting gap on the heavy-electron sheets of the Fermi surface and a negligible gap on the light, three-dimensional pockets.