<div class="csl-bib-body">
<div class="csl-entry">Pustogow, A. (2024, September 26). <i>κ-(ET)2Cu2(CN)3: From Spin-Gapped Mott Insulator to Bad Metal</i> [Conference Presentation]. ISCOM 2024, Anchorage, United States of America (the). http://hdl.handle.net/20.500.12708/210877</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/210877
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dc.description.abstract
The Mott metal-insulator transition is among the most broadly investigated phenomena of correlated electron research – especially in geometrically frustrated materials that promise the realization of a quantum-spin-liquid state. The organic charge transfer salt κ-(ET)2Cu2(CN)3 became the most intensely studied genuine Mott system [1] as it is located at a sweet spot in the phase diagram enabling to examine both frustration effects on its magnetic ground state (ambient pressure) [1-3] as well as the insulator-metal transition (1 – 2 kbar pressure) [3-6]. The latter features first-order phase coexistence [5] as well as an enigmatic bad-metal state with resilient quasiparticles arising from a Fermi-liquid ground state [6].
Here, we perform nuclear magnetic resonance (NMR) and dc transport measurements on the chemical substitution series κ-[(ET)1-x(STF)x]2Cu2(CN)3 spanning from the spin-gapped Mott-insulating state (x = 0) [1-3] to the Fermi-liquid and bad metallic region (x → 1) [5,6]. By probing NMR and dc transport on the same samples over a wide range of correlation strength (equivalent to 20 kbar), we obtain deep insight into the breakdown of coherent charge transport with increasing temperature and correlation strength. Our results imply that the deviations from Fermi-liquid behavior – ρ ∝ T2 and temperature-independent (T1T)-1 – in the bad metal are the consequence of steadily reducing quasiparticle weight Z as temperature increases above TFL. Notably, this trend is opposite to oxides, where Z increases with T [7,8].
References
[1] A. Pustogow, Solids 3, 93–110 (2022).
[2] B. Miksch et al., Science 372, 276-279 (2021).
[3] A. Pustogow et al., Nat. Commun. 14, 1960 (2023).
[4] A. Pustogow et al., Nat. Mater. 17, 773-777 (2018).
[5] A. Pustogow et al., npj Quantum Mater. 6, 9 (2021).
[6] A. Pustogow et al., Nat. Commun. 12, 1571 (2021).
[7] X. Deng et al., Phys. Rev. Lett. 113, 246404 (2014).
[8] A. Hunter et al., Phys. Rev. Lett. 131, 236502 (2023).
en
dc.language.iso
en
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dc.subject
Mott insulators
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dc.subject
bad metal
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dc.subject
organic conductors
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dc.subject
geometrical frustration
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dc.subject
Nuclear Magnetic Resonance
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dc.title
κ-(ET)2Cu2(CN)3: From Spin-Gapped Mott Insulator to Bad Metal
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dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Conference Presentation
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tuw.publication.invited
invited
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tuw.researchTopic.id
M2
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tuw.researchTopic.id
Q6
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.name
Quantum Many-body Systems Physics
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tuw.researchTopic.value
50
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tuw.researchTopic.value
50
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tuw.publication.orgunit
E138-03 - Forschungsbereich Functional and Magnetic Materials
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tuw.author.orcid
0000-0001-9428-5083
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tuw.event.name
ISCOM 2024
en
tuw.event.startdate
22-09-2024
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tuw.event.enddate
27-09-2024
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Anchorage
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tuw.event.country
US
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tuw.event.institution
Johns Hopkins University
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tuw.event.presenter
Pustogow, Andrej
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tuw.event.track
Single Track
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch.oefos
1030
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wb.sciencebranch.value
100
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item.languageiso639-1
en
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item.openairetype
conference paper not in proceedings
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item.grantfulltext
none
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item.fulltext
no Fulltext
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item.cerifentitytype
Publications
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item.openairecristype
http://purl.org/coar/resource_type/c_18cp
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crisitem.author.dept
E138-03 - Forschungsbereich Functional and Magnetic Materials
