Magnetic susceptibility of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>phases of di[bis(ethylenediothiolo)tetrathiafulvalene] tri-iodide [<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mn /><mml:mo>(</mml:mo><mml:mi mathvariant="normal">B</mml:mi><mml:mi mathvariant="normal">E</mml:mi

Rothaemel, Bernd; Forró, Lászlø; Cooper, J. R.; Schilling, J. S.; Weger, M.; Bele, Petra; Brunner, H.; Schweitzer, Dieter; Keller, Heimo J.

doi:10.1103/physrevb.34.704

Cited by 144 publications

(81 citation statements)

References 47 publications

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“…No sign of anisotropy was found, and over the entire temperature range the spin susceptibility has an identical temperature dependence in all directions. In agreement with the transport measurements the application of pressure shifts the drop of the susceptibility to lower temperatures without changing the overall behavior [6,7]. At temperatures below the transition o-(BEDT -TTFhI3 becomes diamagnetic in all directions, indicating that the compound has a non-magnetic ground state.…”

Section: Discussionsupporting

confidence: 57%

“…But there is clearly no formation of a CDW in o-(BEDT-TTFhI3 since no signs of a superstructure were found in X-ray scattering experiments. A recent suggestion [11] that o-(BEDT-TTFhI 3 develops a SDW ground state at 135 K is faced by the results of magnetic susceptibility measurements which show a completely diamagnetic phase below the transition regardless the orientation and application of pressure [7]. The nature of the metal-insulator phase transition at 135 K remains unresolved, but it does not seem to be a Fermi surface instability.…”

Section: Discussionmentioning

confidence: 99%

“…The nearly isotropic conductivity in the (ab)-plane is typically between 60 and 250 (f2cm)-l at room temperature; Ub/Ua ::::: 2 and Ub/Uc ::::: 4000 [2]. The compound undergoes a metal insulator transition at TMI = 135 K. A large number of studies have dealt with the nature of this phase transition [1][2][3][4][5][6][7][8][9], but very little progress has been made. The sudden opening of an energy gap was originally attributed to the formation of a charge density wave (CDW) [10].…”

Section: Introductionmentioning

confidence: 99%

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Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

et al. 1994

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Abstract. -The title compound undergoes a metal-insulator phase transition of unknown origin at TMI = 135 K. We studied the electrodynamic response of Q-(BEDT-TTFhh in a wide range of frequency, covering microwave and millimeter wave frequencies as weIl as the optical spectral range, and found a frequency dependent conductivity up to 1000 cm-1 in the low temperature phase. This is accompanied be a non-linear transport with a smooth onset at about 10 V fcm. Our X-ray studies show no indication of superstructure reflections and clearly rule out the formation of a charge density wave ground state. The lack of a temperature dependence in the millimeter wave conductivity between 20 K and 100 K makes hopping transport unlikely.

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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

et al. 1994

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“…In ␣-͑BEDT-TTF͒ 2 I 3 salt, however, CO transition occurs with the system in a dimeric structure and goes into the spin-Peierls state. 1,18 The relationship between magnetism and symmetry in the CO state of this salt is interesting. Crystal symmetry of this salt suggests that, when CO occurs, the electronic system should go into the spin-Peierls state, similar to ␣-͑BEDT-TTF͒ 2 I 3 salt.…”

Section: E Relation Between Co Transition and Spin Gap Generationmentioning

confidence: 99%

“…2 This salt shows a CO transition at 135 K, leading to the opening of a magnetic gap and the system assuming a spin singlet state. 18 In contrast, -͑BEDT-TTF͒ 2 RbZn͑SCN͒ 4 has one crystallographically independent molecule in unit cell and the space group is I222. 1 This salt shows a CO transition at 190 K; however, due to crystal symmetry, the gap does not open and the system maintains its paramagnetism.…”

Section: Introductionmentioning

confidence: 99%

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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Electron–Electron Interactions in Organic Superconductors

Haddon¹,

Ramirez²,

Glarum³

1994

Advanced Materials

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Superconductivity in organic superconductors is still not properly understood. The normal state magnetism of examples of quasi‐1D,2D, and 3D organic superconductors is summarized and compared. In addition to the results of d.c. magnetization, magnetic susceptibility, and ESR measurements, the densities of states derived from measurements and from badn‐structure calculations are discussed. The importance of electron‐electron interactions for all molecular superconductors is outlined.

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Magnetic susceptibility ofαandβphases of di[bis(ethylenediothiolo)tetrathiafulvalene] tri-iodide [(BE

Cited by 144 publications

References 47 publications

Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

C13NMR study on the charge-ordering saltα′−(

Electron–Electron Interactions in Organic Superconductors

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