Impurities near an antiferromagnetic-singlet quantum critical point

被引：7

作者：

Mendes-Santos, T. ^{[1
,2
]}

Costa, N. C. ^{[1
]}

Batrouni, G. ^{[3
,4
,5
]}

Curro, N. ^{[2
]}

dos Santos, R. R. ^{[1
]}

Paiva, T. ^{[1
]}

Scalettar, R. T. ^{[2
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Fis, Caixa Postal 68-528, BR-21941972 Rio De Janeiro, RJ, Brazil

[2] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[3] Univ Cote Azur, INLN, CNRS, Nice, France

[4] UNS, CNRS, NUS, NTU,Int Joint Res Unit UMI 3654,MajuLab, Singapore, Singapore

[5] Natl Univ Singapore, Ctr Quantum Technol, 2 Sci Dr 3, Singapore 117542, Singapore

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 05期

关键词：

2-DIMENSIONAL HUBBARD-MODEL; NONMAGNETIC IMPURITIES; ELECTRONIC-STRUCTURE; SPIN-LIQUID; ORDER; SUPERCONDUCTORS; TRANSITION; DISORDER; TEMPERATURES; PLANE;

D O I：

10.1103/PhysRevB.95.054419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Heavy-fermion systems and other strongly correlated electron materials often exhibit a competition between antiferromagnetic (AF) and singlet ground states. Using exact quantum Monte Carlo simulations, we examine the effect of impurities in the vicinity of such an AF-singlet quantum critical point (QCP), through an appropriately defined "impurity susceptibility" chi(imp). Our key finding is a connection within a single calculational framework between AF domains induced on the singlet side of the transition and the behavior of the nuclear magnetic resonance (NMR) relaxation rate 1/T-1. We show that local NMR measurements provide a diagnostic for the location of the QCP, which agrees remarkably well with the vanishing of the AF order parameter and large values of chi(imp).

引用

页数：6

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