Low-temperature diffuse X-ray studies of charge-density waves coexisting with spin-density waves in the organic conductors (TMTSF)2PF6 and (TMTSF)2AsF6

Kagoshima, S.; Saso, Y.; Maesato, Mitsuhiko; Kondo, Ryusuke; Hasegawa, Tatsuo

doi:10.1016/s0038-1098(99)00113-1

Cited by 78 publications

(65 citation statements)

References 21 publications

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“…45 If f -wave is competitive against d-wave even in the absence of strong charge fluctuations, it is likely that f -wave dominates over d-wave in the actual (TMTSF) 2 X, where 2k F CDW actually coexists with SDW. 18,19 For the 2D system, the calculation results (at least for the open shell filling) support presence of attractive interaction in the triplet pairing channel. However, singlet d x 2 −y 2 pairing dominates over all the triplet pairings considered in the present study at the band filling n ≃ 4/3, which corresponds to Sr 2 RuO 4 , in agreement with the FLEX calculation.…”

Section: Discussionmentioning

confidence: 69%

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Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model

et al. 2004

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To shed light into the pairing mechanism of possible spin-triplet superconductors (TMTSF)2X and Sr2RuO4, we study the competition among various spin singlet and triplet pairing channels in the Hubbard model by calculating the pairing interaction vertex using the ground state quantum Monte Carlo technique. We model (TMTSF)2X by a quarter-filled quasi-one dimensional (quasi-1D) Hubbard model, and the γ band of Sr2RuO4 by a two dimensional (2D) Hubbard model with a band filling of ∼ 4/3. For the quasi-1D system, we find that triplet f -wave pairing not only dominates over triplet p-wave in agreement with the spin fluctuation theory, but also looks unexpectedly competitive against d-wave. For the 2D system, although the results suggest presence of attractive interaction in the triplet pairing channels, the d-wave pairing interaction is found to be larger than those of the triplet channels.

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Section: Discussionmentioning

confidence: 69%

“…16 A similar proposal has been made by Fuseya et al 17 In fact, the coexistence of 2k F spin and charge density wave has been reported experimentally. 18,19 However, a recent renormalization group study by Fuseya et al 20 has suggested that p-wave pairing dominates over f -wave pairing in quasi-1D systems.…”

Section: Introductionmentioning

confidence: 99%

Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model

et al. 2004

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“…Related to this point, a transport experiment has indicated that the repulsive interaction in θ-(BEDT-TTF) 2 MZn(SCN) 4 (M = Cs,Rb) is long-range [44]. In fact, the presence of such a distant interaction has also been pointed out theoretically [45][46][47]49] for quasi-one-dimensional organic compounds (TMTSF) 2 X in the context of coexisting 2k F spin and 2k F charge density waves [50,51] and spin triplet pairing superconductivity for a review e.g. [48,49], [52][53][54][55][56].…”

Section: Resultsmentioning

confidence: 91%

Theoretical aspects of charge correlations in θ-(BEDT-TTF)₂X

Kuroki

2009

Science and Technology of Advanced Materials

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A review is given on the theoretical studies of charge correlations in θ-(BEDT-TTF) 2 X . Various studies show that within a purely electronic model on the θ-type lattice with on-site U and nearest neighbor V p and V c interactions, the diagonal stripe, c-axis three-fold, and the vertical stripe charge correlations are favored in the regime V p < V c , V p ∼ V c , and V p > V c , respectively. In the realistic parameter regime of V p ∼ V c , there is competition between the c-axis three fold state and diagonal stripe state. Since these are different from the experimentally observed a-axis three fold and the horizontal stripe charge correlations, additional effects have to be included in order to understand the experiments. The electron-lattice coupling, which tends to distort the lattice into the θ d -type, is found to favor the horizontal stripe state, suggesting that the occurrence of this stripe ordering in the actual materials may not be of purely electronic origin. On the other hand, distant electron-electron interactions have to be considered in order to understand the a-axis three fold correlation, whose wave vector is close to the nesting vector of the Fermi surface. These studies seem to suggest that the minimal model to understand the charge correlation in θ-(BEDT-TTF) 2 X may be more complicated than expected. Future problems regarding the competition between different types of charge correlations are discussed.

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“…͑TMTSF͒ 2 X, in contrast, occupy the AFM2 region. Coexisting 2k F CDW and spin-density wave, SDW, with the same 2k F periodicity 49,50 here is explained naturally as the¯1100¯BCSDW. 21,22,51 In contrast to the TMTTF salts discussed above, charge and magnetic orderings, in ͑TMTTF͒ 2 Br occur almost simultaneously.…”

Section: Review Of Experimental Resultsmentioning

confidence: 98%

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

2007

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Clay, R. T.; Hardikar, Rahul; and Mazumdar, S., "Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band" Physical Review B / (2007) It is known that within the interacting electron model Hamiltonian for the one-dimensional 1 4 -filled band, the singlet ground state is a Wigner crystal only if the nearest-neighbor electron-electron repulsion is larger than a critical value. We show that this critical nearest-neighbor Coulomb interaction is different for each spin subspace, with the critical value decreasing with increasing spin. As a consequence, with the lowering of temperature, there can occur a transition from a Wigner crystal charge-ordered state to a spin-Peierls state that is a bond-charge-density wave with charge occupancies different from the Wigner crystal. This transition is possible because spin excitations from the spin-Peierls state in the 1 4 -filled band are necessarily accompanied by changes in site charge densities. We apply our theory to the 1 4 -filled band quasi-one-dimensional organic charge-transfer solids, in general, and to 2:1 tetramethyltetrathiafulvalene ͑TMTTF͒ and tetramethyltetraselenafulvalene cationic salts, in particular. We believe that many recent experiments strongly indicate the Wigner crystal to bond-charge-density Wave transition in several members of the TMTTF family. We explain the occurrence of two different antiferromagnetic phases but a single spin-Peierls state in the generic phase diagram for the 2:1 cationic solids. The antiferromagnetic phases can have either the Wigner crystal or the bond-charge-spin-density wave charge occupancies. The spin-Peierls state is always a bond-charge-density wave.

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Low-temperature diffuse X-ray studies of charge-density waves coexisting with spin-density waves in the organic conductors (TMTSF)2PF6 and (TMTSF)2AsF6

Cited by 78 publications

References 21 publications

Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model

Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model

Theoretical aspects of charge correlations in θ-(BEDT-TTF)₂X

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

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Low-temperature diffuse X-ray studies of charge-density waves coexisting with spin-density waves in the organic conductors (TMTSF)2PF6 and (TMTSF)2AsF6

Cited by 78 publications

References 21 publications

Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model

Quantum Monte Carlo study of the pairing symmetry competition in the Hubbard model

Theoretical aspects of charge correlations in θ-(BEDT-TTF)2X

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

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Theoretical aspects of charge correlations in θ-(BEDT-TTF)₂X