Highly anisotropic gap function in borocarbide superconductor LuNi(2)B(2)C.
作者： Etienne Boaknin , R. W. Hill , Cyril Proust , C. Lupien , Louis Taillefer
DOI: 10.1103/PHYSREVLETT.87.237001
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摘要: The thermal conductivity of borocarbide superconductor $\mathrm{LuNi}{}_{2}{\mathrm{B}}_{2}\mathrm{C}$ was measured down to 70 mK $({T}_{c}/200)$ in a magnetic field perpendicular the heat current from $H\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ above ${H}_{c2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}7\phantom{\rule{0ex}{0ex}}\mathrm{T}$. As soon as vortices enter sample, conduction at $T\ensuremath{\rightarrow}0$ grows rapidly, showing unambiguously that delocalized quasiparticles are present lowest energies. dependence is very similar $\mathrm{UPt}{}_{3}$, heavy-fermion with line nodes gap, and different exponential characteristic $s$-wave superconductors. This strong evidence for highly anisotropic gap function $\mathrm{LuNi}{}_{2}{\mathrm{B}}_{2}\mathrm{C}$, possibly nodes.
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