Competition between different order parameters in a quasi-one-dimensional superconductor

Rozhkov, A. V.

doi:10.1103/physrevb.79.224501

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…Therefore, a "universal" phase diagram 8,9 suggests the superconductivity is in close proximity to the density-wave and most probably originated from non-phonon pairing mechanism. However, the determination of the pairing symmetry for these compound was difficult due to the competition between several energetically close ordering parameters 10 .…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of quasi-one-dimensional superconductor K2Cr3As3 from first-principles calculations

Jiang

Cao

2015

Sci Rep

130

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The electronic structure of quasi-one-dimensional superconductor K2Cr3As3 is studied through systematic first-principles calculations. The ground state of K2Cr3As3 is paramagnetic. Close to the Fermi level, the , dxy, and orbitals dominate the electronic states, and three bands cross EF to form one 3D Fermi surface sheet and two quasi-1D sheets. The electronic DOS at EF is less than 1/3 of the experimental value, indicating a large electron renormalization factor around EF. Despite of the relatively small atomic numbers, the antisymmetric spin-orbit coupling splitting is sizable (≈60 meV) on the 3D Fermi surface sheet as well as on one of the quasi-1D sheets. Finally, the imaginary part of bare electron susceptibility shows large peaks at Γ, suggesting the presence of large ferromagnetic spin fluctuation in the compound.

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Section: Introductionmentioning

confidence: 99%

Electronic structure of quasi-one-dimensional superconductor K2Cr3As3 from first-principles calculations

Jiang

Cao

2015

Sci Rep

130

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“…However, the pairing mechanism is still far from an established settlement for (TMTSF) 2 X in spite of several theoretical studies. [3][4][5][6][7][8][9] Synchronous to the theoretical struggle, a number of experimental studies have been also made to clarify the superconducting pairing symmetry for (TMTSF) 2 ClO 4 . The superconducting transition temperature for (TMTSF) 2 (ClO 4 ) 1−x (ReO 4 ) x is suppressed by a tiny amount of nonmagnetic impurities.…”

Section: Introductionmentioning

confidence: 99%

“…8 Afterward, several theoretical studies have suggested effective models with or without the anion ordering to discuss the pairing mechanism. [3][4][5][6][7]9 However, there has been no first-principles calculation taking account of the anion ordering. Here, we emphasize that a trustful band calculation resolves the effects of the anion ordering on the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Superconducting gap function in the organic superconductor (TMTSF)2ClO4with anion ordering; First-principles calculations and quasiclassical analysis for ang

2011

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We calculate angle-dependent heat capacity in a low magnetic field range on the basis of the Kramer-Pesch approximation together with an electronic structure obtained by first-principles calculations to determine a superconducting gap function of (TMTSF) 2 ClO 4 through its comparisons with experiments. The present comparative studies reveal that a nodal d-wave gap function consistently explains the experimental results for (TMTSF) 2 ClO 4 . It is especially emphasized that the observed unusual axis asymmetry of the angle dependence eliminates the possibility of s-wave and nodeless d-wave functions. It is also found that the directional ordering of ClO 4 anions does not have any significant effects on the Fermi surface structure contrary to the previous modelings since the two Fermi surfaces obtained by the band calculations almost cross within the present full accuracy in first-principles calculations.

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“…( 19) the Heaviside step function is denoted as θ(x). System of equations ( 18), (19) for the unknown variable k has solutions only when 0 < ω < ω sdw 1 , where…”

Section: B Evaluation Of the Susceptibility Tensormentioning

confidence: 99%

Dynamical spin susceptibility of spin-valley half-metal

Khokhlov,

Rakhmanov,

Rozhkov

et al. 2020

Preprint

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A few years ago we predicted theoretically that in systems with nesting of the Fermi surface the spin-valley half-metal has lower energy than the spin density wave state. In this paper we suggest a possible way to distinguish these phases experimentally. We calculate dynamical spin susceptibility tensor for both states in the framework of the Kubo formalism. Discussed phases have different numbers of the bands: four bands in the spin-valley half-metal and only two bands in the spin density wave. Therefore, their susceptibilities, as functions of frequency, have different number of peaks. Besides, the spin-valley half-metal does not have rotational symmetry, thus, in general the off-diagonal components of susceptibility tensor are non-zero. The spin density wave obeys robust rotational symmetry and off-diagonal components of the susceptibility tensor are zero. These characteristic features can be observed in experiments with inelastic neutron scattering.

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Competition between different order parameters in a quasi-one-dimensional superconductor

Cited by 6 publications

References 28 publications

Electronic structure of quasi-one-dimensional superconductor K2Cr3As3 from first-principles calculations

Electronic structure of quasi-one-dimensional superconductor K2Cr3As3 from first-principles calculations

Superconducting gap function in the organic superconductor (TMTSF)2ClO4with anion ordering; First-principles calculations and quasiclassical analysis for ang

Dynamical spin susceptibility of spin-valley half-metal

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