Yb取代CeCoIn5的Wilson比
Wilson ratio in Yb-substituted CeCoIn5
摘要：
我们研究了Yb替代对泡利极限重费米子超导体CeCoIn $_5$的影响。Yb在整个掺杂范围内充当Ce的非磁性二价取代基，相当于稀土位点上的空穴掺杂。我们发现（Ce，Yb）CoIn $_5$中的上临界场是Pauli限制的，而约化的（H，T）相图对无序不敏感，正如在纯轨道限制的情况下所预期的那样.我们利用泡利极限场、超导凝聚能和电子比热系数确定了CeCoIn的威尔逊比（$R_{W}$），即比热系数与泡利磁化率的比值$_5$。该方法适用于任何泡利极限超导体的清洁极限。
英文摘要：
We have investigated the effect of Yb substitution on the Pauli limited, heavy fermion superconductor, CeCoIn$_5$. Yb acts as a non-magnetic divalent substituent for Ce throughout the entire doping range, equivalent to hole doping on the rare earth site. We found that the upper critical field in (Ce,Yb)CoIn$_5$ is Pauli limited, yet the reduced (H,T) phase diagram is insensitive to disorder, as expected in the purely orbitally limited case. We use the Pauli limiting field, the superconducting condensation energy and the electronic specific heat coefficient to determine the Wilson ratio ($R_{W}$), the ratio of the specific heat coefficient to the Pauli susceptibility in CeCoIn$_5$. The method is applicable to any Pauli limited superconductor in the clean limit.
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