Physical Review B, volume 97, issue 7, publication number 075118
Sb 121 , 123 FeSb 2
GIPPIUS A. A.
1, 2
,
Zhurenko S. V.
2
,
Zhurenko S V
2
,
Hu R.
3
,
Hu R. G.
3
,
Petrovic C.
3
,
Baenitz M.
1
1
Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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Publication type: Journal Article
Publication date: 2018-02-12
Journal:
Physical Review B
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 24699950, 24699969, 10980121, 1550235X
Abstract
$^{121,123}Sb$ nuclear quadrupole resonance (NQR) was applied to $Fe(Sb_{1-x}Te_x)_2$ in the low doping regime (\emph{x = 0, 0.01} and \emph{0.05}) as a microscopic zero field probe to study the evolution of \emph{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) $1/T_1(T)$ probes the fluctuations at the $Sb$ - site. The fluctuations originate either from conduction electrons or from magnetic moments. In contrast to the semi metal $FeSb_2$ with a clear signature of the charge and spin gap formation in $1/T_1(T)T ( \sim exp/ (\Delta k_BT) ) $, the 1\% $Te$ doped system exhibits almost metallic conductivity and a almost filled gap. A weak divergence of the SLRR coefficient $1/T_1(T)T \sim T^{-n} \sim T^{-0.2}$ points towards the presence of electronic correlations towards low temperatures wheras the \textit{5\%} $Te$ doped sample exhibits a much larger divergence in the SLRR coefficient showing $1/T_1(T)T \sim T^{-0.72} $. According to the specific heat divergence a power law with $n\ =\ 2\ m\ =\ 0.56$ is expected for the SLRR. Furthermore $Te$-doped $FeSb_2$ as a disordered paramagnetic metal might be a platform for the electronic Griffith phase scenario. NQR evidences a substantial asymmetric broadening of the $^{121,123}Sb$ NQR spectrum for the \emph{5\%} sample. This has purely 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.
Citations by journals
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Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan
1 publication, 100%
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Citations by publishers
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Physical Society of Japan
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Physical Society of Japan
1 publication, 100%
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GIPPIUS A. A. et al. 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 // Physical Review B. 2018. Vol. 97. No. 7. 075118
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GIPPIUS A. A., Zhurenko S. V., Zhurenko S. V., Hu R., Hu R. G., Petrovic C., 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 // Physical Review B. 2018. Vol. 97. No. 7. 075118
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TY - JOUR
DO - 10.1103/physrevb.97.075118
UR - https://doi.org/10.1103%2Fphysrevb.97.075118
TI - 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
T2 - Physical Review B
AU - GIPPIUS, A. A.
AU - Zhurenko, S V
AU - Hu, R.
AU - Petrovic, C.
AU - Baenitz, M.
AU - Zhurenko, S. V.
AU - Hu, R. G.
PY - 2018
DA - 2018/02/12 00:00:00
PB - American Physical Society (APS)
IS - 7
VL - 97
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
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@article{2018_GIPPIUS,
author = {A. A. GIPPIUS and S V Zhurenko and R. Hu and C. Petrovic and M. Baenitz and S. V. Zhurenko and R. G. Hu},
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},
journal = {Physical Review B},
year = {2018},
volume = {97},
publisher = {American Physical Society (APS)},
month = {feb},
url = {https://doi.org/10.1103%2Fphysrevb.97.075118},
number = {7},
doi = {10.1103/physrevb.97.075118}
}
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