Ce（1-x）Yb（x）CoIn中非费米液体的量子临界行为（5）
Non-Fermi liquid behavior with and without quantum criticality in Ce(1-x)Yb(x)CoIn(5)
摘要：
朗道的费米液体理论-金属的标准理论-面临的最大挑战之一是具有强电子相关性的复杂材料。在这些材料中，非费米液体输运和热力学性质通常由发生在量子临界点（QCP）的连续量子相变的存在来解释。QCP可以通过施加压力、磁场或改变化学成分来显示。在重费米子化合物CeCoIn $_5$中，QCP被认为在定义正常态和超导态的微观结构中起决定性作用。然而，QCP是否必须存在于材料的相图中以诱导非费米液体行为并触发超导性的问题仍然悬而未决。在这里，我们表明，通过掺杂Yb完全抑制CeCoIn $_5$中的场致QCP对非常规超导性和非费米液体行为的影响令人惊讶地小。这意味着非费米液态金属的行为可能是一种新的物质状态，而不是潜在的量子相变的结果。
英文摘要：
One of the greatest challenges to Landau's Fermi liquid theory - the standard theory of metals - is presented by complex materials with strong electronic correlations. In these materials, non-Fermi liquid transport and thermodynamic properties are often explained by the presence of a continuous quantum phase transition which happens at a quantum critical point (QCP). A QCP can be revealed by applying pressure, magnetic field, or changing the chemical composition. In the heavy-fermion compound CeCoIn$_5$, the QCP is assumed to play a decisive role in defining the microscopic structure of both normal and superconducting states. However, the question of whether QCP must be present in the material's phase diagram to induce non-Fermi liquid behavior and trigger superconductivity remains open. Here we show that the full suppression of the field-induced QCP in CeCoIn$_5$ by doping with Yb has surprisingly little impact on both unconventional superconductivity and non-Fermi liquid behavior. This implies that the non-Fermi liquid metallic behavior could be a new state of matter in its own right rather then a consequence of the underlying quantum phase transition.
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