Nature of field-induced antiferromagnetic order in Zn-doped CeCoIn5 and its connection to quantum criticality in the pure compound
Nature of field-induced antiferromagnetic order in Zn-doped CeCoIn5 and its connection to quantum criticality in the pure compound
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DOI：
10.1103/physrevb.105.054515
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发表时间：
2022-02
影响因子：
3.7
通讯作者：
M. Yokoyama;Y. Honma;Y. Oshima;Rahmanto;Kohei Suzuki;K. Tenya;Y. Shimizu;D. Aoki;A. Matsuo;K. Kindo;S. Nakamura;Y. Kono;S. Kittaka;T. Sakakibara
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文献类型：
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作者：
M. Yokoyama;Y. Honma;Y. Oshima;Rahmanto;Kohei Suzuki;K. Tenya;Y. Shimizu;D. Aoki;A. Matsuo;K. Kindo;S. Nakamura;Y. Kono;S. Kittaka;T. Sakakibara
量子临界性在强关联电子系统中超导性的非常规性质中发挥着重要作用。然而，负责量子临界性的内禀反铁磁（AFM）序参量在原型非常规超导体中尚未确定。在这项工作中，磁化强度和比热测量表明，场诱导AFM秩序与Zn掺杂，沿着，其临界场的连续增加，高达10 T。与AFM相变相关联的弱信号强烈地表明AFM相的空间不均匀演化，其特征随着Zn浓度的降低而变得明显。温度，磁场，和Zn浓度的相图是由这些实验结果构建的。发现在该图中，外推AFM临界场的依赖关系得到了与量子临界点位置相一致的f的值。在AFM临界场下，比热在所有范围内都表现出非费米液态的发散行为特征。临界场以上比热数据的标度分析导致标度参数作为函数的连续变化。这些发现提供了强有力的证据，量子临界涨落inoriginated从序参数对应的场诱导AFM状态中观察到的Zn掺杂系统。
Quantum criticality plays an important role in the unconventional nature of superconductivity in strongly correlated electron systems. However, the intrinsic antiferromagnetic (AFM) order parameter responsible for quantum criticality has been unidentified in the prototypical unconventional superconductor. In this work, magnetization and specific-heat measurements forwithdemonstrate that the field-induced AFM order develops with Zn doping, along with a continuous increase in its critical field up to 10 T at. The weak signals associated with the AFM phase transition strongly suggest spatially inhomogeneous evolution of the AFM phase, whose feature becomes pronounced with decreasing the Zn concentration. The temperature, magnetic field, and Zn concentration phase diagram is constructed from those experimental results. It is found that, in this diagram, extrapolating thedependence of the AFM critical field yields the value offor, which coincides with the location of the quantum critical point in. The specific heat showsdiverging behavior characteristic of the non-Fermi-liquid state at the AFM critical fields for all of therange. The scaling analysis for the specific-heat data above critical fields leads to continuous variations of the scaling parameters as a function of. These findings provide strong evidence that the quantum critical fluctuations inoriginate from the order parameter corresponding to the field-induced AFM state observed in Zn-doped systems.