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Title: Sb 121 , 123 nuclear quadrupole resonance as a microscopic probe in the Te-doped correlated semimetal FeSb 2 : Emergence of electronic Griffith phase, magnetism, and metallic behavior

Abstract

121,123Sb nuclear quadrupole resonance (NQR) was applied to Fe(Sb1-xTex)2 in the low doping regime (x = 0 , 0.01, and 0.05) as a microscopic zero field probe to study the evolution of 3d magnetism and the emergence of metallic behavior. Whereas the NQR spectra itself reflects the degree of local disorder via the width of the individual NQR lines, the spin lattice relaxation rate (SLRR) 1/T1 (T) probes the fluctuations at the Sb site. The fluctuations originate either from conduction electrons or from magnetic moments. In contrast to the semimetal FeSb2 with a clear signature of the charge and spin gap formation in 1/T1(T)T[~exp/(ΔkBT)] , the 1% Te-doped system exhibits almost metallic conductivity and the SLRR nicely confirms that the gap is almost filled. A weak divergence of the SLRR coefficient 1/T1(T)T ~ T-n ~ T-0.2 points towards the presence of electronic correlations towards low temperatures. This is supported by the electronic specific heat coefficient γ = (Cel/T) showing a power-law divergence γ (T) ~ T-m ~ (1/T1T)1/2 ~ T-n/2 ~ Cel/T which is expected in the renormalized Landau Fermi liquid theory for correlated electrons. In contrast to that the 5% Te-doped sample exhibits a much larger divergence in themore » SLRR coefficient showing 1/T1(T)T ~ T-0.72 . According to the specific heat divergence a power law with n = 2 m = 0.56 is expected for the SLRR. This dissimilarity originates from admixed critical magnetic fluctuations in the vicinity of antiferromagnetic long range order with 1/T1(T)T ~ T-3/4 behavior. Furthermore Te-doped FeSb2 as a disordered paramagnetic metal might be a platform for the electronic Griffith phase scenario. NQR evidences a substantial asymmetric broadening of the 121,123Sb NQR spectrum for the 5% sample. Lastly, this has a predominant electronic origin in agreement with the electronic Griffith phase and stems probably from an enhanced Sb-Te bond polarization and electronic density shift towards the Te atom inside Sb-Te dumbbell.« less

Authors:
 [1];  [2];  [3];  [3];  [4]
+ Show Author Affiliations
  1. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); M.V. Lomonosov Moscow State University (Russia). Faculty of Physics
  2. M.V. Lomonosov Moscow State University (Russia). Faculty of Physics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department
  4. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1430876
Alternate Identifier(s):
OSTI ID: 1420201
Report Number(s):
BNL-203432-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1802629
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 7; 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

Gippius, A. A., Zhurenko, S. V., Hu, R., Petrovic, Cedomir, and Baenitz, M. Sb121,123 nuclear quadrupole resonance as a microscopic probe in the Te-doped correlated semimetal FeSb2 : Emergence of electronic Griffith phase, magnetism, and metallic behavior. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.075118.
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Gippius, A. A., Zhurenko, S. V., Hu, R., Petrovic, Cedomir, & Baenitz, M. Sb121,123 nuclear quadrupole resonance as a microscopic probe in the Te-doped correlated semimetal FeSb2 : Emergence of electronic Griffith phase, magnetism, and metallic behavior. United States. https://doi.org/10.1103/PhysRevB.97.075118
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Gippius, A. A., Zhurenko, S. V., Hu, R., Petrovic, Cedomir, and Baenitz, M. Mon . "Sb121,123 nuclear quadrupole resonance as a microscopic probe in the Te-doped correlated semimetal FeSb2 : Emergence of electronic Griffith phase, magnetism, and metallic behavior". United States. https://doi.org/10.1103/PhysRevB.97.075118. https://www.osti.gov/servlets/purl/1430876.
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@article{osti_1430876,
title = {Sb121,123 nuclear quadrupole resonance as a microscopic probe in the Te-doped correlated semimetal FeSb2 : Emergence of electronic Griffith phase, magnetism, and metallic behavior},
author = {Gippius, A. A. and Zhurenko, S. V. and Hu, R. and Petrovic, Cedomir and Baenitz, M.},
abstractNote = {121,123Sb nuclear quadrupole resonance (NQR) was applied to Fe(Sb1-xTex)2 in the low doping regime (x = 0 , 0.01, and 0.05) as a microscopic zero field probe to study the evolution of 3d magnetism and the emergence of metallic behavior. Whereas the NQR spectra itself reflects the degree of local disorder via the width of the individual NQR lines, the spin lattice relaxation rate (SLRR) 1/T1 (T) probes the fluctuations at the Sb site. The fluctuations originate either from conduction electrons or from magnetic moments. In contrast to the semimetal FeSb2 with a clear signature of the charge and spin gap formation in 1/T1(T)T[~exp/(ΔkBT)] , the 1% Te-doped system exhibits almost metallic conductivity and the SLRR nicely confirms that the gap is almost filled. A weak divergence of the SLRR coefficient 1/T1(T)T ~ T-n ~ T-0.2 points towards the presence of electronic correlations towards low temperatures. This is supported by the electronic specific heat coefficient γ = (Cel/T) showing a power-law divergence γ (T) ~ T-m ~ (1/T1T)1/2 ~ T-n/2 ~ Cel/T which is expected in the renormalized Landau Fermi liquid theory for correlated electrons. In contrast to that the 5% Te-doped sample exhibits a much larger divergence in the SLRR coefficient showing 1/T1(T)T ~ T-0.72 . According to the specific heat divergence a power law with n = 2 m = 0.56 is expected for the SLRR. This dissimilarity originates from admixed critical magnetic fluctuations in the vicinity of antiferromagnetic long range order with 1/T1(T)T ~ T-3/4 behavior. Furthermore Te-doped FeSb2 as a disordered paramagnetic metal might be a platform for the electronic Griffith phase scenario. NQR evidences a substantial asymmetric broadening of the 121,123Sb NQR spectrum for the 5% sample. Lastly, this has a predominant electronic origin in agreement with the electronic Griffith phase and stems probably from an enhanced Sb-Te bond polarization and electronic density shift towards the Te atom inside Sb-Te dumbbell.},
doi = {10.1103/PhysRevB.97.075118},
journal = {Physical Review B},
number = 7,
volume = 97,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2018},
month = {Mon Feb 12 00:00:00 EST 2018}
}
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Journal Article:
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https://doi.org/10.1103/PhysRevB.97.075118
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Figures / Tables:

FIG. 1. FIG. 1. : (color online). 121,123$Sb$ spectra measured at 4.2 K in $Fe$($Sb$1−x$Te$$x$)2 compounds with $x$ = 0.01 (lower panel) and 0.05 (upper panel). For comparison, the same $Sb$ NQR lines for the undoped $FeSb$2 measured at 10 K and retrieved from [19] are presented (lower panel). The intensities ofmore » all transitions except $ν$2 line (55.9 MHz; | ±3/2〉 ↔| ±5/2〉 transition) for the $Fe$($Sb$0.95$Te$0.05)2 sample are normalized on their maximum intensity values. Inset: 123$Sb$ $ν$3 line (88.0 MHz; | ±5/2〉 ↔| ±7/2〉 transition) and 122$Sb$ $ν$2 line (95.1 MHz; | ±5/2〉 ↔| ±7/2〉 transition) without normalization for the $Fe$($Sb$0.95$Te$0.05)2 sample. Solid lines are guides for eye.« less
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    FIG. 5. (p. 7)figure
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