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Enhancement of electron correlations and spin density wave fluctuations of the organic superconductor λ−(BETS)2GaCl4 under pressure proved by C13 NMR
- Source :
- Physical Review B. 103
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
Abstract
- We performed $^{13}\mathrm{C}$ NMR measurements on an organic superconductor $\ensuremath{\lambda}\text{\ensuremath{-}}{(\mathrm{B}\mathrm{E}\mathrm{T}\mathrm{S})}_{2}\mathrm{Ga}{\mathrm{Cl}}_{4}$ [BETS: bis(ethylenedithio)tetraselenafulvalene] to investigate the pressure effect on the spin density wave (SDW) fluctuations at low temperatures, which were observed at ambient pressure. We found that the spin-lattice relaxation rate divided by temperature $(1/{T}_{1}T)$ is significantly enhanced at low temperatures at 3 kbar, implying enhancement of the SDW fluctuation. When further pressure is applied, increase in $1/{T}_{1}T$ at low temperatures is suppressed and $1/{T}_{1}T$ becomes temperature independent, indicating the Fermi liquid state. Moreover, we revealed that the Korringa factor under pressure becomes double compared to its value at ambient pressure, suggesting a significant change in electron correlation. We discuss the effect of the SDW fluctuation and the electron correlation on the unconventional superconductivity.
- Subjects :
- Superconductivity
Physics
Condensed matter physics
Electronic correlation
02 engineering and technology
Electron
021001 nanoscience & nanotechnology
Lambda
01 natural sciences
0103 physical sciences
Organic superconductor
Spin density wave
Condensed Matter::Strongly Correlated Electrons
Fermi liquid theory
010306 general physics
0210 nano-technology
Ambient pressure
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........4b4fcf0e38294a10b679c7d0612d10d2
- Full Text :
- https://doi.org/10.1103/physrevb.103.045112