High-Pressure Studies of Layered Organic Superconductors up to 9 GPa: Research of Pressure Effect on Exactly and Nearly Half-Filled Systems in Organics

Taniguchi, Hiromi; Okuhata, Takahiro; Nagai, Takuya; Miyashita, M.; Uchiyama, Kenichi; Satoh, Kazuhiko; Môri, N.; Hedo, Masato; Uwatoko, Yoshiya

doi:10.1143/jpsjs.76sa.168

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…One of possibilities is some of squared lattice component involved to the triangular lattice, and the system underwent to the Mott insulating state instead of superconducting state. In fact, by applying pressure up to 2.6 GPa, superconductivity emerged in the κ-HgCl [9]. Further analysis and theoretical studies are required.…”

Section: Additive Manufacturing Technologies and Advanced Materialsmentioning

confidence: 99%

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Magnetic Susceptibility Study of Hole-Doped Organic Metal κ-(ET)4Hg3-δCl8, δ=22% and κ-(ET)4Hg3-δBr8, δ=11%

Sari

Widyaiswari

Someya

et al. 2023

SSP

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The Non-Fermi-Liquid (NFL) state has been one of central issues in the strongly correlated electrons systems. This deviates from conventional Fermi Liquid (FL) behavior. In the hole-doped triangular lattice organic metal κ-(ET)4Hg3-δBr8, δ = 11% (κ-HgBr), the NFL state is observed as a linear temperature dependence of the resistivity which changed to the temperature square dependence behavior by pressure. The spin susceptibility dependence of the muon Knight shift, K(c), is not linear in the region below 50 K, unlike in other k-type organic superconductors. Furthermore, 13C-NMR study under pressure concluded that strong antiferromagnetic spin fluctuations (AFSF) contribute to the origin of NFL. To understand the underlying correlation of the enhanced AFSF and NFL state in k-HgBr, the K(c) plot study in the sister compound κ-(ET)4Hg3-δCl8, δ=22% (κ-HgCl) which shows metal to insulator transition at TMI ~ 20 K is desirable. In this study, we report a precise susceptibility measurement in both k-HgBr and k-HgCl. Furthermore, we summarize the c(T) data of k-HgBr and k-HgCl and discuss them from the viewpoint of the triangular and square lattice models.

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Section: Additive Manufacturing Technologies and Advanced Materialsmentioning

confidence: 99%

“…It has an estimated value of U/W = 1.89, larger than that of κ-HgBr, where U is the on-site Coulomb interaction and W is the bandwidth. This compound shows metal to insulator transition at TMI ~ 20 K [9]. We aim to understand the enhanced AFSF down to low-temperature and the NFL state in both compounds.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Susceptibility Study of Hole-Doped Organic Metal κ-(ET)4Hg3-δCl8, δ=22% and κ-(ET)4Hg3-δBr8, δ=11%

Sari

Widyaiswari

Someya

et al. 2023

SSP

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“…The pressure capabilities of the Ni-Cr-Al and MP35N devices have been reported to be 4.0 and 3.5 GPa, respectively. 13,14 However, technical information on the application of these newly developed high-pressure cells to organic materials has not yet been widely reported, except for a study on a high-performance pressuretransmitting medium. Very recently, these devices have been successfully applied to the study of a limited number of organic materials, 18 including those mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Short piston-cylinder pressure cells based on Ni–Cr–Al cylinders and their application to fragile materials

Taniguchi

Takeda

Satoh

et al. 2010

Review of Scientific Instruments

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In this decade, the performance of piston-cylinder pressure cells has been drastically improved by using robust materials such as nickel-chromium-aluminum and cobalt-nickel-chromium-molybdenum alloys to construct the inner cylinders. In this article, we present several experimental techniques for carrying out resistivity measurements under high pressure by applying the piston-cylinder devices based on the nickel-chromium-aluminum cylinders to fragile materials such as organics. These techniques are, in principle, applicable to measurements on any solid-state conductor. First, we introduce the construction of our piston-cylinder cells including two kinds of wired platforms for transport measurements. Second, we describe the construction of the platforms and the method of introducing the samples. After reporting test results for conventional materials such as ammonium fluoride, bismuth, and tellurium, lastly, we present examples of the successful application of our method to organic materials.

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Organic superconductors with an incommensurate anion structure

Kawamoto

Takimiya

2009

Science and Technology of Advanced Materials

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Superconducting incommensurate organic composite crystals based on the methylenedithio-tetraselenafulvalene (MDT-TSF) series donors, where the energy band filling deviates from the usual 3/4-filled, are reviewed. The incommensurate anion potential reconstructs the Fermi surface for both (MDT-TSF)(AuI) and (MDT-ST)(I) neither by the fundamental anion periodicity nor by 2 , but by 3 , where MDT-ST is 5-2-(1,3-dithiol-2-ylidene)-1,3-diselena-4,6-dithiapentalene, and is the reciprocal lattice vector of the anion lattice. The of the reconstructing vectors is associated with the magnitude of the incommensurate potential. The considerably large interlayer transfer integral and three-dimensional superconducting properties are due to the direct donor-donor interactions coming from the characteristic corrugated conducting sheet structure. The materials with high superconducting transition temperature, , have large ratios of the observed cyclotron masses to the bare ones, which indicates that the strength of the many-body effect is the major determinant of . (MDT-TS)(AuI) shows a metal-insulator transition at =50 K, where MDT-TS is 5-2-(1,3-diselenol-2-ylidene)-1,3,4,6-tetrathiapentalene, and the insulating phase is an antiferromagnet with a high Néel temperature (=50 K) and a high spin-flop field (=6.9 T). There is a possibility that this material is an . Hydrostatic pressure suppresses the insulating state and induces superconductivity at=3.2 K above 1.05 GPa, where rises to the maximum,=4.9 K at 1.27 GPa. This compound shows a usual temperature-pressure phase diagram, in which the superconducting phase borders on the antiferromagnetic insulating phase, despite the unusual band filling.

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High-Pressure Studies of Layered Organic Superconductors up to 9 GPa: Research of Pressure Effect on Exactly and Nearly Half-Filled Systems in Organics

Cited by 5 publications

References 11 publications

Magnetic Susceptibility Study of Hole-Doped Organic Metal κ-(ET)<sub>4</sub>Hg<sub>3-δ</sub>Cl<sub>8, </sub>δ=22% and κ-(ET)<sub>4</sub>Hg<sub>3-δ</sub>Br<sub>8, </sub>δ=11%

Magnetic Susceptibility Study of Hole-Doped Organic Metal κ-(ET)<sub>4</sub>Hg<sub>3-δ</sub>Cl<sub>8, </sub>δ=22% and κ-(ET)<sub>4</sub>Hg<sub>3-δ</sub>Br<sub>8, </sub>δ=11%

Short piston-cylinder pressure cells based on Ni–Cr–Al cylinders and their application to fragile materials

Organic superconductors with an incommensurate anion structure

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