Tanatar M A, Paglione Johnpierre, Nakatsuji S, Hawthorn D G, Boaknin E, Hill R W, Ronning F, Sutherland M, Taillefer Louis, Petrovic C, Canfield P C, Fisk Z
Department of Physics, University of Toronto, Toronto, Ontario, Canada.
Phys Rev Lett. 2005 Aug 5;95(6):067002. doi: 10.1103/PhysRevLett.95.067002.
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.
在重费米子材料Ce(1 - x)La(x)CoIn5的超导态下测量了热导率和比热容。随着杂质浓度x的增加，Tc的抑制伴随着d波超导体预期的剩余电子比热容的增加，但它与剩余电子热导率的降低同时发生。这种相反的行为揭示了未凝聚电子与节点准粒子共存的存在。提出了一种极端多带情形，在费米面的重电子片上有一个d波超导能隙，而在轻的三维口袋上能隙可忽略不计。
