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Title: Impurities near an antiferromagnetic-singlet quantum critical point

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.
Authors:
 [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
  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
Publication Date:
Grant/Contract Number:
NA0001842; NA0002908
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Univ. of California, Davis, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1344106
Alternate Identifier(s):
OSTI ID: 1344004