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Title: Impurity-induced antiferromagnetic domains in the periodic Anderson model

Abstract

A central feature of the periodic Anderson model is the competition between antiferromagnetism, mediated by the Ruderman-Kittel-Kasuya-Yosida interaction at small conduction electron-local electron hybridization V, and singlet formation at large V. At zero temperature, and in dimension d>1, these two phases are separated by a quantum critical point Vc. We also use quantum Monte Carlo (QMC) simulations to explore the effect of impurities which have a local hybridization V*c in the antiferromagnetic regime which are embedded in a bulk singlet phase with V>Vc. We then measure the suppression of singlet correlations and the antiferromagnetic correlations which form around the impurity, as well as the size of the resulting domain. Exact diagonalization calculations for linear chains allow us to verify that the qualitative features obtained at intermediate coupling and finite T persist to strong coupling and T=0, regimes which are difficult to access with QMC. Our calculations show an agreement qualitatively with NMR measurements in CeCoIn5-xCdx.

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of Tunis El-Manar (Tunisia). Dept. of Physics; Univ. of California, Davis, CA (United States). Dept. of Physics
  2. Univ. of California, Davis, CA (United States). Dept. of Computer Science
  3. Univ. of California, Davis, CA (United States). Dept. of Physicsc
  4. Univ. of California, Davis, CA (United States). Dept. of Physics
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1344105
Alternate Identifier(s):
OSTI ID: 1297272
Grant/Contract Number:  
NA0001842; NA0002908
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 8; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Benali, A., Bai, Z. J., Curro, N. J., and Scalettar, R. T. Impurity-induced antiferromagnetic domains in the periodic Anderson model. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.085132.
Benali, A., Bai, Z. J., Curro, N. J., & Scalettar, R. T. Impurity-induced antiferromagnetic domains in the periodic Anderson model. United States. doi:https://doi.org/10.1103/PhysRevB.94.085132
Benali, A., Bai, Z. J., Curro, N. J., and Scalettar, R. T. Wed . "Impurity-induced antiferromagnetic domains in the periodic Anderson model". United States. doi:https://doi.org/10.1103/PhysRevB.94.085132. https://www.osti.gov/servlets/purl/1344105.
@article{osti_1344105,
title = {Impurity-induced antiferromagnetic domains in the periodic Anderson model},
author = {Benali, A. and Bai, Z. J. and Curro, N. J. and Scalettar, R. T.},
abstractNote = {A central feature of the periodic Anderson model is the competition between antiferromagnetism, mediated by the Ruderman-Kittel-Kasuya-Yosida interaction at small conduction electron-local electron hybridization V, and singlet formation at large V. At zero temperature, and in dimension d>1, these two phases are separated by a quantum critical point Vc. We also use quantum Monte Carlo (QMC) simulations to explore the effect of impurities which have a local hybridization V*c in the antiferromagnetic regime which are embedded in a bulk singlet phase with V>Vc. We then measure the suppression of singlet correlations and the antiferromagnetic correlations which form around the impurity, as well as the size of the resulting domain. Exact diagonalization calculations for linear chains allow us to verify that the qualitative features obtained at intermediate coupling and finite T persist to strong coupling and T=0, regimes which are difficult to access with QMC. Our calculations show an agreement qualitatively with NMR measurements in CeCoIn5-xCdx.},
doi = {10.1103/PhysRevB.94.085132},
journal = {Physical Review B},
number = 8,
volume = 94,
place = {United States},
year = {2016},
month = {8}
}

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Figures / Tables:

FIG. 1 FIG. 1: FIG. 1. (Color online) Exact diagonalization results for the f orbital impurity susceptibility on near neighbor sites.more » $\chi$$^{imp}_{ff}$ (r = 1) probes the response of AF correlations to a local shift in VV* = V - dV . $\chi$$^{imp}_{ff}$ (r = 1) is peaked at intermediate values of fd hybridization: At large V , deep in the singlet phase, $\chi$$^{imp}_{ff}$ (r = 1), is small. Similarly, $\chi$$^{imp}_{ff}$(r = 1) also declines as V → 0, deep in the AF regime. A maximum occurs at intermediate V . Results are given for onsite f electron repulsion Uf = 4, 8, 12.« less

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