Strong-Coupling Approach to Antiferromagnetic Ordering Driven by Paramagnetic Pair-Breaking in d-Wave Superconducting Phase
Strong-Coupling Approach to Antiferromagnetic Ordering Driven by Paramagnetic Pair-Breaking in d-Wave Superconducting Phase
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DOI：
10.7566/jpsj.83.024713
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发表时间：
2013-09
影响因子：
1.7
通讯作者：
Y. Hatakeyama;R. Ikeda
中科院分区：
文献类型：
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作者：
Y. Hatakeyama;R. Ikeda
最近通过弱耦合方法发现，\(d_{x^{2} - y^{2}}\) 配对超导相中的场感应反铁磁 (AFM) 有序性是泡利顺磁对断裂 (PPB) 与 CeCoIn5 中高场行为相关的基本机制，通过强耦合方法研究了电子相关性。将涨落交换（FLEX）近似应用于包含塞曼项的二维哈伯德模型，我们发现PPB诱导的超导（SC）相AFM有序性和Hc2（T）上的一阶SC跃迁在强耦合方法和弱耦合模型中实现，并且AFM有序性受到准粒子重正化和SC有序参数幅度的影响。这种 AFM 排序可能出现在接近 AFM 量子临界点 (QCP) 的多种材料中。
The field-induced antiferromagnetic (AFM) ordering in the \(d_{x^{2} - y^{2}}\)-paired superconducting phase, which has recently been found, by the weak-coupling approach, to be a basic mechanism due to Pauli paramagnetic pair breaking (PPB) in relation to the high-field behaviors in CeCoIn5, is studied by the strong-coupling approach, taking account of the electron correlation. Applying the fluctuation–exchange (FLEX) approximation to the two-dimensional Hubbard model including the Zeeman term, we show that the PPB-induced AFM ordering in the superconducting (SC) phase and the first-order SC transition on Hc2(T) are realized in the strong-coupling approach as well as those in the weak-coupling model, and that the AFM ordering is affected by the quasiparticle renormalization and the amplitude of the SC order parameter. This AFM ordering may appear in a wide range of materials close to an AFM quantum critical point (QCP).