Coherence temperature in the diluted periodic Anderson model
Coherence temperature in the diluted periodic Anderson model
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DOI：
10.1103/physrevb.99.195116
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发表时间：
2018-12
影响因子：
3.7
通讯作者：
N. Costa;T. Mendes-Santos;T. Paiva;N. Curro;R. R. D. Santos-R.;R. Scalettar
中科院分区：
文献类型：
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作者：
N. Costa;T. Mendes-Santos;T. Paiva;N. Curro;R. R. D. Santos-R.;R. Scalettar
众所周知，近藤和周期安德森模型（PAM）提供了重费米子材料的许多基本性质的微观图像，更一般地说，是在$4f$和$5f$系统中的各种强相关现象。在本文中，我们应用行列式量子蒙特卡罗（DQMC）方法来包含PAM中的无序性，特别是去除局部化轨道的一小部分$x$。我们确定了相干温度$T^*$的演化，在此温度下，局部矩和传导电子在重费米子流体中缠绕在一起，具有$x$和局域轨道和传导轨道之间的杂化$V$。我们恢复了掺杂重费米子在T^*$中观测到的几个主要趋势，并且还表明，在这个理论框架内，计算的核磁共振弛豫率跟踪了纯和掺杂CeCoIn$_5$的实验测量行为。我们的研究结果有助于解释无序、强相关系统的局部探针的重要问题。
The Kondo and Periodic Anderson Model (PAM) are known to provide a microscopic picture of many of the fundamental properties of heavy fermion materials and, more generally, a variety of strong correlation phenomena in $4f$ and $5f$ systems. In this paper, we apply the Determinant Quantum Monte Carlo (DQMC) method to include disorder in the PAM, specifically the removal of a fraction $x$ of the localized orbitals. We determine the evolution of the coherence temperature $T^*$, where the local moments and conduction electrons become entwined in a heavy fermion fluid, with $x$ and with the hybridization $V$ between localized and conduction orbitals. We recover several of the principal observed trends in $T^*$ of doped heavy fermions, and also show that, within this theoretical framework, the calculated Nuclear Magnetic Resonance (NMR) relaxation rate tracks the experimentally measured behavior in pure and doped CeCoIn$_5$. Our results contribute to important issues in the interpretation of local probes of disordered, strongly correlated systems.