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Salameh, B.; Nothardt, A.; Balthes, E.; Schmidt, W.; Schweitzer, Dieter; Strempfer, J.; Hinrichsen, Bernd; Jansen, Martin; Maude, D. K.

doi:10.1103/physrevb.75.054509

Cited by 15 publications

(19 citation statements)

References 40 publications

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“…9 It is metallic in the whole temperature range, 9 and the Fermi surface has been confirmed by quantum oscillation [10][11][12][13][14][15] and optical 16,17 experiments. Magnetic susceptibility exhibits weak temperature dependence, 15,18 characteristic of the Pauli paramagnetism.…”

Section: Introductionmentioning

confidence: 84%

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated by
Hirata
¹
,
Miyagawa²,
Kanoda³
et al. 2012
Phys. Rev. B

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We report a 13 C-NMR study on the ambient-pressure metallic phase of the layered organic conductor θ-(BEDT-TTF) 2 I 3 [BEDT-TTF: bisethylenedithio-tetrathiafulvalene], which is expected to connect the physics of correlated electrons and Dirac electrons under pressure. The orientation dependence of the NMR spectra shows that all BEDT-TTF molecules in the unit cell are to be seen equivalent from a microscopic point of view. This feature is consistent with the orthorhombic symmetry of the BEDT-TTF sublattice and also indicates that the monoclinic I 3 sublattice, which should make three molecules in the unit cell nonequivalent, is not practically influential on the electronic state in the conducting BEDT-TTF layers at ambient pressure. There is no signature of charge disproportionation in opposition to most of the θ-type BEDT-TTF salts. The analyses of NMR Knight shift, K, and the nuclear spin-lattice relaxation rate, 1/T 1 , revealed that the degree of electron correlation, evaluated by the Korringa ratio [∝ 1/(T 1 T K 2 )], is in an intermediate regime.However, NMR relaxation rate 1/T 1 is enhanced above ∼ 200K, which possibly indicates that the system enters into a quantum critical regime of charge-order fluctuations as suggested theoretically.

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Section: Introductionmentioning

confidence: 84%

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated by
Hirata
¹
,
Miyagawa²,
Kanoda³
et al. 2012
Phys. Rev. B

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“…Figure 16 shows the Raman spectra of θ-CsZn and θ-I 3 along with the electrical resistivity of θ-CsZn [94]. θ-(ET) 2 I 3 is metallic down to low temperature and undergoes a superconducting transition at 3.6 K [107,108]. In both compounds, ν 2 appears as a single peak near the frequency of ρ = 0.5 [46] over the whole temperature range.…”

Section: θ-(Bedt-ttf) 2 X (X = Cszn(scn) 4 I 3 )mentioning

confidence: 99%

Infrared and Raman Studies of Charge Ordering in Organic Conductors, BEDT-TTF Salts with Quarter-Filled Bands

Yakushi

2012

Crystals

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This paper reviews charge ordering in the organic conductors, β″-(BEDT-TTF) (TCNQ), θ-(BEDT-TTF) 2 X, and α-(BEDT-TTF) 2 X. Here, BEDT-TTF and TCNQ represent bis(ethylenedithio)tetrathiafulvalene and 7,7,8,8-tetracyanoquinodimethane, respectively. These compounds, all of which have a quarter-filled band, were evaluated using infrared and Raman spectroscopy in addition to optical conductivity measurements. It was found that β″-(BEDT-TTF)(TCNQ) changes continuously from a uniform metal to a chargeordered metal with increasing temperature. Although charge disproportionation was clearly observed, long-range charge order is not realized. Among six θ-type salts, four compounds with a narrow band show the metal-insulator transition. However, they maintain a large amplitude of charge order (Δρ~0.6) in both metallic and insulating phases. In the X = CsZn(SCN) 4 salt with intermediate bandwidth, the amplitude of charge order is very small (Δρ < 0.07) over the whole temperature range. However, fluctuation of charge order is indicated in the Raman spectrum and optical conductivity. No indication of the fluctuation of charge order is found in the wide band X = I 3 salt. In α-(BEDT-TTF) 2 I 3 the amplitude of charge order changes discontinuously from small amplitude at high temperature to large amplitude (Δρ max~0 .6) at low temperature. The long-range chargeordered state shows ferroelectric polarization with fast optical response. The fluctuation of multiple stripes occurs in the high-temperature metallic phase. Among α-(BEDT-TTF) 2 MHg(SCN) 4 (X = NH 4 , K, Rb, Tl), the fluctuation of charge order is indicated only in the X = NH 4 salt. α′-(BEDT-TTF) 2 IBr 2 shows successive phase transitions to the ferroelectric state keeping a large amplitude of charge order (Δρ max~0 .8) over the whole temperature range. It was found that the amplitude and fluctuation of charge order in these compounds is enhanced as the kinetic energy (bandwidth) decreases. OPEN ACCESSCrystals 2012, 2 1292

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“…In Table IV we report the calculated values of the Hubbard parameters and the Coulomb integral for ET molecules in experimental geometries [35][36][37][38][39] taken from the ␣, ␤, , and polymorphs of ͑ET͒ 2 I 3 . All of the calculations in this section were performed using TZP basis sets and TM2 pseudopotentials.…”

Section: Impurity Scattering Polymorphism and Chemical Pressurementioning

confidence: 99%

“…Figures 4-6 show the calculated values of, respectively, U m ͑v͒ , ⑀ m , and m for experimental geometries taken from x-ray scattering experiments on crystals with a wide range of anions and several different polymorphs. The crystallographic data sets [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] used to determine the nuclear positions include data taken at a range of temperatures and under different pressures. Details of the calculated Hubbard parameters and the crystallographic measurements on which the calculations are based are given in the supplementary information.…”

Section: Impurity Scattering Polymorphism and Chemical Pressurementioning

confidence: 99%

See 1 more Smart Citation

Toward the parametrization of the Hubbard model for salts of bis(ethylenedithio)tetrathiafulvalene: A density functional study of isolated molecules

Scriven

Powell

2009

The Journal of Chemical Physics

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Articles you may be interested in A self-consistent Hubbard U density-functional theory approach to the addition-elimination reactions of hydrocarbons on bare FeO + J. Chem. Phys. 129, 134314 (2008) argue that this variation in the site energy plays a key role in understanding the role of disorder in bis͑ethylenedithio͒tetrathiafulvalene salts. We explain the differences between the ␤ L and ␤ H phases of ͑BEDT-TTF͒ 2 I 3 on the basis of calculations of the effects of disorder.

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Electronic properties of the organic metalsΘ−(BEDT−TTF)2I3and

Cited by 15 publications

References 40 publications

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated by
Hirata
¹
,
Miyagawa²,
Kanoda³
et al. 2012
Phys. Rev. B

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated by
Hirata
¹
,
Miyagawa²,
Kanoda³
et al. 2012
Phys. Rev. B

Infrared and Raman Studies of Charge Ordering in Organic Conductors, BEDT-TTF Salts with Quarter-Filled Bands

Toward the parametrization of the Hubbard model for salts of bis(ethylenedithio)tetrathiafulvalene: A density functional study of isolated molecules

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Electronic properties of the organic metalsΘ−(BEDT−TTF)2I3and

Cited by 15 publications

References 40 publications

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated byHirata1, Miyagawa2, Kanoda3 et al. 2012Phys. Rev. B

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated byHirata1, Miyagawa2, Kanoda3 et al. 2012Phys. Rev. B

Infrared and Raman Studies of Charge Ordering in Organic Conductors, BEDT-TTF Salts with Quarter-Filled Bands

Toward the parametrization of the Hubbard model for salts of bis(ethylenedithio)tetrathiafulvalene: A density functional study of isolated molecules

Contact Info

Product

Resources

About

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated by
Hirata
¹
,
Miyagawa²,
Kanoda³
et al. 2012
Phys. Rev. B

Electron correlations in the quasi-two-dimensional organic conductorθ-(BEDT-TTF)2I3investigated by
Hirata
¹
,
Miyagawa²,
Kanoda³
et al. 2012
Phys. Rev. B