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Yamamoto, Kaoru; Yakushi, Kyuya; Miyagawa, Kazuya; Kanoda, K.; Kawamoto, Atsushi

doi:10.1103/physrevb.65.085110

Cited by 148 publications

(141 citation statements)

References 32 publications

(40 reference statements)

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“…8 Indeed, a CO state was confirmed in ␣-͑BEDT-TTF͒ 2 I 3 and -͑BEDT-TTF͒ 2 RbZn͑SCN͒ 4 and in similar salts. [9][10][11][12][13][14] Moreover, superconductivity was observed in ␣-͑BEDT-TTF͒ 2 I 3 under uniaxial stress and in -͑BEDT-TTF͒ 2 I 3 ͑Refs. 15 and 16͒ under ambient pressure.…”

Section: Introductionmentioning

confidence: 95%

“…We utilized a single crystal of ␣Ј-͑BEDT-TTF͒ 2 IBr 2 in which one side of central carbon atoms in the BEDT-TTF molecules was substituted with 13 C nuclei using crosscoupling between thioketone and ketone. The coupling between thioketone and ketone reacts in preference to those between ketone and ketone, thioketone and thioketone.…”

Section: Methodsmentioning

confidence: 99%

“…1͑b͔͒. As there are two 13 C sites each on the A and B molecules, four NMR lines were expected from these sites. We applied a magnetic field parallel to the ab plane of this salt and obtained an NMR spectrum consisting of four peaks ͑Fig.…”

Section: A Peak Assignment Of Nmr Spectrummentioning

confidence: 99%

“…Therefore NMR is complementary to vibrational spectroscopy and get the different information from the respect to the time scale. We have therefore utilized 13 C NMR to determine whether a CO state is present, as well as to assess the pattern of the CO state, and its magnetism.…”

Section: Introductionmentioning

confidence: 99%

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C13NMR study on the charge-ordering saltα′−(

Hirose

Kawamoto

2009

Phys. Rev. B

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Among quasi-two-dimensional organic conductors, ͑BEDT-TTF͒ 2 X, what form the two column structure of ␣ or is thought to show a charge-ordering insulating state. The ␣Ј modification is the other candidate for a charge-ordering state. To determine the existence of a charge-ordering state and electron magnetism in the ␣Ј phase, which has a symmetry that differs from that of the ␣ and phases, we utilized 13 C-NMR to examine ␣Ј-͑BEDT-TTF͒ 2 IBr 2 in which one side of the central carbon on the BEDT-TTF molecule is substituted with 13 C nuclei. We observed changes in its spectrum at 200 K. The angular dependence of the NMR shift at 15 K indicated that the charge-ordering pattern is intracolumn disproportionation and the ratio of charge disproportionation on the spin-poor site and spin-rich sites is almost 1:0. The angle dependence of NMR spectrum at 60 K suggests that the hyperfine coupling tensor in the paramagnetic charge-ordering state is determined not only by the charge density of on-site molecules but also by the contribution of off-site molecules. The change in hyperfine coupling tensor must be taken into account in NMR studies of the paramagnetic CO state.

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Section: Introductionmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: A Peak Assignment Of Nmr Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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C13NMR study on the charge-ordering saltα′−(

Hirose

Kawamoto

2009

Phys. Rev. B

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“…Salt with another packing arrangement, α-(BEDT-TTF) 2 X and θ-(BEDT-TTF) 2 X, has been a topic of interest due to the metal-insulator (MI) transition and charge disproportionation by off-site coulomb interaction [22][23][24][25][26][27][28][29]. In this type of organic conductor, various charge disproportionation patterns are realized, and these patterns give important information about the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules

2012

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Quasi-One and quasi-two dimensional organic conductors consisting of TTF derivatives such as BEDT-TTF (bis-(ethylene-dithio)-tetra-thia-fulvalene) and TMTCF (C = S; TMTTF: tetra-methyl-tetra-thia-fulvalene, C = Se; TMTSF: tetra-methyl-tetraselena-fulvalene) have been well investigated in condensed matter physics because of interest in the emerging electric and magnetic properties, such as the spin density wave, charge order, superconductivity, anti-ferromagnetism, and so on. To probe the electronic state, nuclear magnetic resonance (NMR) is one of the most powerful tools as the microscopic magnetometer. A number of 13 C-NMR studies have been performed of the double-site central 13 C= 13C bond substituted molecules. However, problems with the coupled spin system of 13 C= 13 C complicated the interpretation for observations on NMR.Therefore, single-site 13 C-enriched molecules are desired. We summarize the problem of Pake doublet and the preparation of the single-site 13 C-susbstituted BEDT-TTF and TMTCF molecules. We also demonstrate the superiority of 13 C-NMR of the single-site 13 C-susbstituted molecule utilizing the hyperfine coupling tensor.

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Quenching of Charge and Spin Degrees of Freedom in Condensed Matter

Kagawa

Ôike

2016

Advanced Materials

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Electrons in condensed matter have internal degrees of freedom, such as charge, spin, and orbital, leading to various forms of ordered states through phase transitions. However, in individual materials, a charge/spin/orbital ordered state of the lowest temperature is normally uniquely determined in terms of the lowest-energy state, i.e., the ground state. Here, recent results are summarized showing that under rapid cooling, this principle does not necessarily hold, and thus, the cooling rate is a control parameter of the lowest-temperature state beyond the framework of the thermoequilibrium phase diagram. Although the cooling rate utilized in low-temperature experiments is typically 2 × 10 to 4 × 10 K s , the use of optical/electronic pulses facilitates rapid cooling, such as 10 -10 K s . Such an unconventionally high cooling rate allows some systems to kinetically avoid a first-order phase transition, resulting in a quenched charge/spin state that differs from the ground state. It is also demonstrated that quenched states can be exploited as a non-volatile state variable when designing phase-change memory functions. The present findings suggest that rapid cooling is useful for exploring and controlling the metastable electronic/magnetic state, which is potentially hidden behind the ground state.

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Charge ordering inθ−(BEDT−TTF)2

Cited by 148 publications

References 32 publications

C13NMR study on the charge-ordering saltα′−(

C13NMR study on the charge-ordering saltα′−(

Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules

Quenching of Charge and Spin Degrees of Freedom in Condensed Matter

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