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@ARTICLE{Psztorov:862180,
author = {Pásztorová, J. and Howell, A. and Songvilay, M. and
Sarte, P. M. and Rodriguez-Rivera, J. A. and
Arévalo-López, A. M. and Schmalzl, K. and Schneidewind, A.
and Dunsiger, S. R. and Singh, D. K. and Petrovic, C. and
Hu, R. and Stock, C.},
title = {{R}elaxing {K}ondo-screened {K}ramers doublets in
{C}e{R}h{S}i 3},
journal = {Physical review / B},
volume = {99},
number = {12},
issn = {2469-9950},
address = {Woodbury, NY},
reportid = {FZJ-2019-02528},
pages = {125144},
year = {2019},
abstract = {CeRhSi3 is a superconductor under pressure coexisting with
a weakly antiferromagnetic phase characterized by a Bragg
peak at →q0=(∼0.2,0,0.5) [N. Aso et al., J. Magn. Magn.
Mater. 310, 602 (2007)]. The compound is also a
heavy-fermion material with a large specific heat
coefficient γ=110 mJ mol−1K−2 and a high Kondo
temperature of TK=50 K, indicating CeRhSi3 is in a strongly
Kondo screened state. We apply high-resolution neutron
spectroscopy to investigate the magnetic fluctuations in the
normal phase, at ambient pressures, and at low temperatures.
We measure a commensurate dynamic response centered around
the →Q=(0,0,2) position that gradually evolves to H∼0.2
with decreasing temperature and/or energy transfers. The
response is broadened both in momentum and energy and is not
reminiscent of sharp spin wave excitations found in
insulating magnets where the electrons are localized. We
parametrize the excitation spectrum and temperature
dependence using a heuristic model utilizing the
random-phase approximation to couple relaxing Ce3+
ground-state Kramers doublets with a Kondo-like dynamic
response. With a Ruderman-Kittel-Kasuya-Yosida exchange
interaction within the ab plane and an increasing
single-site susceptibility, we can qualitatively reproduce
the neutron spectroscopic results in CeRhSi3 and, namely,
the trade-off between scattering at commensurate and
incommensurate positions. We suggest that the
antiferromagnetic phase in CeRhSi3 is driven by weakly
correlated relaxing localized Kramers doublets and that
CeRhSi3 at ambient pressures is on the border between a
Rudderman-Kittel-Yosida antiferromagnetic state and a
Kondo-screened phase where static magnetism is predominately
absent.},
cin = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-ILL / JCNS-FRM-II},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
$I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-ILL-20110128 /
I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {144 - Controlling Collective States (POF3-144) / 524 -
Controlling Collective States (POF3-524) / 6212 - Quantum
Condensed Matter: Magnetism, Superconductivity (POF3-621) /
6213 - Materials and Processes for Energy and Transport
Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)PANDA-20140101 /
EXP:(DE-Juel1)ILL-IN12-20150421},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000462898900009},
doi = {10.1103/PhysRevB.99.125144},
url = {https://juser.fz-juelich.de/record/862180},
}