Superconductivity induced by extremely high pressures in organic Mott-insulator β'-(BEDT-TTF)2IBrCl

Kano, Masayuki; Uchiyama, Kenichi; Taniguchi, Hiromi; Hedo, Masato; Matsubayashi, Kazuyuki; Uwatoko, Yoshiya

doi:10.1088/1742-6596/150/5/052093

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…Organic (Jérome, et al, 1980) was discovered through the use of P where the highest T c of 14.2 K among the charge-transfer salts was also observed in β′-(BEDT-TTF) 2 ICl 2 at a P of 8.5 GPa (Fig. 38) (Taniguchi, et al, 2003;Kano, et al 2009.). Early experiments on fullerides showed that the lattice contraction is not in favor of T c enhancement (Sparn, et al, 1991).…”

Section: F Organic Superconductorsmentioning

confidence: 99%

“…This offers a clue for enhancing the T c through the lattice expansion. From Kano, et al 2009. Organic salts are very sensitive to applied P. In most cases superconductivity can be readily suppressed with the application of P (Sparn, et al, 1991) and an insulating state can even be reached at higher P (Hagel, et al, 2003). This is observed within fullerides, where applying P often reduces the T c in ambient-P fulleride superconductors.…”

Section: F Organic Superconductorsmentioning

confidence: 99%

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Solids, liquids, and gases under high pressure

et al. 2018

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Pressure has long been recognized as a fundamental thermodynamic variable but its application was previously limited by the available pressure vessels and probes. The development of megabar diamond anvil cells and a battery of associated in-laboratory and synchrotron techniques at the turn of the century have opened a vast new window of opportunities. With the addition of the pressure dimension, we are facing a new world with an order of magnitude more materials to be discovered than all that have been explored at ambient pressure. Pressure drastically and categorically alters all elastic, electronic, magnetic, structural, and chemical properties, and pushes materials across conventional barriers between insulators and superconductors, amorphous and crystalline solids, ionic and covalent compounds, vigorously reactive and inert chemicals, etc. In the process, it reveals surprising high-pressure physics and chemistry and creates novel materials. This review describes the principles and methodology used to reach ultrahigh static pressure; the in situ probes, the physical phenomena to be investigated, the longpursued goals, the surprising discoveries, and the vast potential opportunities. Exciting examples include the quest for metallic hydrogen, the record-breaking superconducting temperature of 203 K in HnS, the complication of "free electron gas" alkali metals, the magnetic collapse in 3d transition elements, the pressure-induced topological superconductors, the novel stoichiometry in simple compounds, the interaction of nanoscience, the accomplishment of 750 GPa pressure, etc. These highlights are the integral results of technological achievements, specific measurements, and theoretical advancement; therefore, the same highlights will appear in different sections corresponding to these different aspects. Overall, this review demonstrates that highpressure research is a new dimension in condensed-matter physics. III. Multiple Probes for High P-T In Situ Characterizations A. High-P optical absorptive and reflective microscopy and spectroscopy B. High-P inelastic optical scattering 1. High-P optical Raman spectroscopy 2. High-P Brillouin spectroscopy B. P-induced amorphization and its size dependence C. P-induced devitrification D. P-induced polyamorphism and liquid-liquid transition V. "Simple" 1s Electron Systems Under Compression A. The quest for metallic hydrogen B. The rich high P-T phase diagram of hydrogen C. Helium-the widest-gap insulator VI. P-Effects on Electron Bonding Structures A. P-effects on s, p-electron bonding B. Compressional behavior of free electron gas C. P-induced Fermi surface nesting VII. High-P Studies on d-Electron Systems A. Spin-pairing transition B. Mott insulator to metal transition C. Magnetic ordering transition D. Spin-liquid transition E. Phase separation and colossal magnetoresistence in manganites VIII. High-P Studies on f-Electron Systems A. Volume collapse and mixed valences in f-electron materials B. Quantum criticality and quantum phase transition C. f-electron Superconduct...

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Section: F Organic Superconductorsmentioning

confidence: 99%

Section: F Organic Superconductorsmentioning

confidence: 99%

Solids, liquids, and gases under high pressure

et al. 2018

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“…Interestingly, the superconductivity in (TMTSF) 2 PF 6 occurs with the suppression of the spin-density-wave instability at high pressures. 3,4 Other materials, such as the organic charge-transfer salts based on donor molecules, [5][6][7][8][9] the edge shared aromatic hydrocarbons, [10][11][12] also have been observed to superconduct. In addition, it is worth mentioning that p-terphenyl was found to be superconductors with T c as high as 123 K, 13 far above liquid nitrogen boiling temperature, which could comparable to the record high T c of about 130 K in some cuprate superconductors.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in potassium-doped 2,2$'$-bipyridine

Zhang¹,

Wang²,

Qin³

et al. 2018

Preprint

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Organic compounds are always promising candidates of superconductors with high transition temperatures. We examine this proposal by choosing 2,2 -bipyridine solely composed by C, H, and N atoms. The presence of Meissner effect with a transition temperature of 7.2 K in this material upon potassium doping is demonstrated by the dc magnetic susceptibility measurements. The real part of the ac susceptibility exhibits the same transition temperature as that in dc magnetization, and a sharp peak appeared in the imaginary part indicates the formation of the weakly linked superconducting vortex current. The occurence of superconductivity is further supported by the resistance drop at the transition together with its suppression by the applied magnetic fields. The superconducting phase is identified to be K3-2,2 -bipyridine from the analysis of Raman scattering spectra. This work not only opens an encouraging window for finding superconductivity after optoelectronics in 2,2 -bipyridine-based materials but also offers an example to realize superconductivity from conducting polymers and their derivatives.

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“…Therefore, the κ-like arrangement in 3 can be regarded as a square lattice as in the case of β′-(ET) 2 X salts (0.16 for X = ICl 2 and 0.19 for X = AuCl 2 ), whereas the κ-(ET) 2 X salts based on spin-1/2 (ET) 2 •+ dimers exhibits a more or less triangular form. − , The present assembly possibly provides an important clue for the preferential production of ET cation radical salts with the square spin–lattice, although the (ET) 2 2+ dimers in 3 are diamagnetic. Notably, among the ET family, the β′-(ET) 2 X salts based on spin-1/2 (ET) 2 •+ dimers are a typical strongly correlated system, and indeed, some of them exhibit long-range AF ordering and superconductivity under applied pressures. , …”

Section: Resultsmentioning

confidence: 99%

“…Notably, among the ET family, the β'-(ET)2X salts based on spin-1/2 (ET)2 •+ dimers are a typical strongly correlated system, and indeed, some of them exhibit long-range AF ordering and superconductivity under applied pressures. 44,45 Salt 4 appears to exhibit some similarities with 3, in addition to striking differences. The molecular arrangement is very similar to that of 3, but the space group at low temperature is different (monoclinic P21/c at 298 K and triclinic P1 at 100 K).…”

Section: (Et)2zn[c(cn)3]br3 (2)mentioning

confidence: 94%

BEDT-TTF Salts Formed with Tetrahedrally Coordinated Zinc(II) Complex Anions

Yoshida

Itô

Nakamura

et al. 2016

Crystal Growth & Design

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12 kinds of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) cation salts with tetrahedrally coordinated zinc(II) complex anions were obtained by electrocrystallization; most of them were produced via the additional reaction of Lewis-basic cyano-containing anions [N(CN)2-, C(CN)3-, and Au(CN)2-] with ZnX2 (X = Cl-, Brand nd SCN-) occurred during electrocrystallization. Based on the charge and arrangement of ET molecules, these salts were predominantly categorized into four groups: (A) isolated ET •+ dimers or tetramers, (B) infinite ET •+ ribbon, (C) infinite layers either with a peculiar ET 0.5+ arrangement or of ET molecules with partial charges other than +0.5, and (D) infinite layers of ET 0.5+ molecules. In A, zinc(II) complex anions including a unidentate-coordinated C(CN)3 or Au(CN)2 group spatially interrupt the infinite arrangement of ET molecules. The ET •+ ribbon in B runs parallel to the pseudo-polymeric chain of disordered Zn[C(CN)3]2Br2 2ions. In C, two salts are semiconductive, whereas the remaining two salts behave metallic at room temperature and undergo a metal-insulator transition on cooling. The ET molecules in D are arranged in a θ42+40-like packing motif, due to the non-planar anionic layers. All salts

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Superconductivity induced by extremely high pressures in organic Mott-insulator β'-(BEDT-TTF)2IBrCl

Cited by 4 publications

References 3 publications

Solids, liquids, and gases under high pressure

Solids, liquids, and gases under high pressure

Superconductivity in potassium-doped 2,2$'$-bipyridine

BEDT-TTF Salts Formed with Tetrahedrally Coordinated Zinc(II) Complex Anions

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