UTe2: A narrow-band superconductor
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00143482" target="_blank" >RIV/00216224:14310/25:00143482 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prresearch/pdf/10.1103/t6hm-q647" target="_blank" >https://journals.aps.org/prresearch/pdf/10.1103/t6hm-q647</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/t6hm-q647" target="_blank" >10.1103/t6hm-q647</a>
Alternative languages
Result language
angličtina
Original language name
UTe2: A narrow-band superconductor
Original language description
We investigate the nature of the 5 f electrons in the unconventional odd-parity superconductor UTe2, focusing on the degree of covalency, localization versus itinerancy, and dominant electronic configuration. This is achieved using density functional theory (DFT) in combination with dynamical mean-field theory (DMFT) calculations. A key aspect of our approach is the material-specific tuning of the double-counting correction parameter, mu dc, within the DFT + DMFT part. This tuning is guided by the energy dependence of photoionization cross sections in valence band photoelectron spectroscopy. The reliability of the parameters is confirmed by the accurate reproduction of the angle-resolved valence-band photoemission spectra and the U 4 f core-level data. The DFT + DMFT model reveals that in UTe2 U 5 fn configurations with n = 1-4 contribute to the ground state, with the 5 f 2 configuration being most prevalent and an average 5 f shell filling close to 2.5. The model further suggests that the 5 f electrons form narrow bands and that charge fluctuations due to degeneracy play a role in addition to coherent valence dynamics arising from hybridization with the conduction bath. Additionally, the significance of the U 6d states in UTe2 is discussed.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Research
ISSN
2643-1564
e-ISSN
2643-1564
Volume of the periodical
7
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
1-12
UT code for WoS article
001623248700003
EID of the result in the Scopus database
2-s2.0-105022879163