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Title: Impurities near an antiferromagnetic-singlet quantum critical point

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [2];  [2];  [4]
  1. Federal Univ. of Rio de Janeiro (Brazil). Inst. of Physics; Univ. of California, Davis, CA (United States). Dept. of Physics; UC Davis
  2. Federal Univ. of Rio de Janeiro (Brazil). Inst. of Physics
  3. Univ. of Cote d'Azur (France); CNRS-UNS-NUS-NTU International Joint Research Unit (Singapore). Majulab; National Univ. of Singapore (Singapore). Centre for Quantum Technologies
  4. Univ. of California, Davis, CA (United States). Dept. of Physics
+ Show Author Affiliations

Heavy-fermion systems and other strongly correlated electron materials often exhibit a competition between antiferromagnetic (AF) and singlet ground states. We examine the effect of impurities in the vicinity of such an AF-singlet quantum critical point (QCP), through an appropriately defined “impurity susceptibility” χimp, using exact quantum Monte Carlo simulations. 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/T1. Furthermore, 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 χimp.

Research Organization:
Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001842; NA0002908
OSTI ID:
1344106
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 95; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Tunable magnetism of a hexagonal Anderson droplet on the triangular lattice journal July 2019
Coherence temperature in the diluted periodic Anderson model journal May 2019
Random-Singlet Phase in Disordered Two-Dimensional Quantum Magnets journal December 2018
Tunable magnetism of a hexagonal Anderson droplet on the triangular lattice text January 2019

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