Selenium isotope effect in the layered bismuth chalcogenide superconductor 
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Hoshi, Kazuhisa; Goto, Yosuke; Mizuguchi, Yoshikazu

doi:10.1103/physrevb.97.094509

Cited by 36 publications

(36 citation statements)

References 29 publications

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“…Conventional shifts in T c between samples synthesised with 32 S and 34 S were observed, which suggests the importance of phonons for the pairing mechanisms in the compound. The conventional isotope effects in (Sr,La)FBiS, which has a monoclinic structure, are in contrast to the unconventional isotope effects observed in La(O,F)BiSSe and Bi 4 O 4 S 3 , which have a tetragonal structure 26 , 27 . Based on a combination of the discussion of previous and present isotope studies, we suggest that the structural difference between the tetragonal and monoclinic structures could be a switch of the pairing mechanisms in BiCh 2 -based superconductors.…”

Section: Introductionmentioning

confidence: 91%

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Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Yamashita

Usui

Hoshi

et al. 2021

Sci Rep

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Investigation of isotope effects on superconducting transition temperature (Tc) is one of the useful methods to examine whether electron–phonon interaction is essential for pairing mechanisms. The layered BiCh2-based (Ch: S, Se) superconductor family is a candidate for unconventional superconductors, because unconventional isotope effects have previously been observed in La(O,F)BiSSe and Bi4O4S3. In this study, we investigated the isotope effects of 32S and 34S in the high-pressure phase of (Sr,La)FBiS2, which has a monoclinic crystal structure and a higher Tc of ~ 10 K under high pressures, and observed conventional-type isotope shifts in Tc. The conventional-type isotope effects in the monoclinic phase of (Sr,La)FBiS2 are different from the unconventional isotope effects observed in La(O,F)BiSSe and Bi4O4S3, which have a tetragonal structure. The obtained results suggest that the pairing mechanisms of BiCh2-based superconductors could be switched by a structural-symmetry change in the superconducting layers induced by pressure effects.

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Section: Introductionmentioning

confidence: 91%

“…To emphasise the presence of quasi-one-dimensional network in the monoclinic phase (e), only the shorter Bi-S bonds were depicted. For comparison of the isotope effect exponent ( α ) and the crystal structure, α S for (Sr,La)FBiS 2 , α Se for La(O,F)BiSSe 26 , and α S for Bi 4 O 4 S 3 27 (a half unit cell) are shown. …”

Section: Introductionmentioning

confidence: 99%

Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Yamashita

Usui

Hoshi

et al. 2021

Sci Rep

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“…In addition, the large ratio 2Δ/T c may suggest that the pairing mechanism is unconventional [17,18]. In addition, no isotope effect on superconducting transition temperature was found [19].Very recently, using 'ab initio' approach the strength of the electron-phonon coupling in LaO 0.5 F 0.5 BiS 2 was estimated to be λ<0.5 [20], which is too low to explain the superconducting transition temperature in this system. Electron-electron correlations can, in principle, be also responsible for the Copper pairing and there OPEN ACCESS RECEIVED…”

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confidence: 84%

Section: Introductionmentioning

confidence: 97%

Spin–orbit coupling, minimal model and potential Cooper-pairing from repulsion in BiS₂-superconductors

et al. 2018

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We develop the realistic minimal electronic model for recently discovered BiS 2 superconductors including the spin-orbit (SO) coupling based on the first-principles band structure calculations. Due to strong SO coupling, characteristic for the Bi-based systems, the tight-binding low-energy model necessarily includes p x , p y , and p z orbitals. We analyze a potential Cooper-pairing instability from purely repulsive interaction for the moderate electronic correlations using the so-called leading angular harmonics approximation. For small and intermediate doping concentrations we find the dominant instabilities to be d x y 2 2 --wave, and s ± -wave symmetries, respectively. At the same time, in the absence of the sizable spin fluctuations the intra and interband Coulomb repulsions are of the same strength, which yield the strongly anisotropic behavior of the superconducting gaps on the Fermi surface. This agrees with recent angle resolved photoemission spectroscopy findings. In addition, we find that the Fermi surface topology for BiS 2 layered systems at large electron doping can resemble the doped iron-based pnictide superconductors with electron and hole Fermi surfaces maintaining sufficient nesting between them. This could provide further boost to increase T c in these systems.

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“…The BiS 2 -based layered compounds have been attracting attention as the novel superconductors [1][2][3][4][5][6], and various measurements have been performed to reveal the superconducting mechanism [7][8][9][10][11]. LaOBiS 2 has a layered structure, which consists of a charge suppling layer (LaO) + and a conducting layer (BiS 2 ) - [1].…”

Section: Introductionmentioning

confidence: 99%

Hydrostatic Pressure Effect in Non-Doping LaOBiSSe and Hole-Doping La₁₋_xSr_xOBiS₂

Kondo

Matsumoto

Kase

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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We investigated the non-doping LaOBiSSe and the hole-doping La 1-x Sr x OBiS 2 by the hydrostatic pressure effect. We measured the temperature dependence of the electrical resistivity of LaOBiSSe within the temperature range of 3-300 K by applying several hydrostatic pressures using a cubic anvil cell. An upturn was observed below 80 K at ambient pressure. The upturn was suppressed up to 2.0 GPa but it re-emerged up to 8.0 GPa. The electrical resistivity of La 1-x Sr x OBiS 2 (x = 0.1, 0.2) showed semiconducting-like behavior under ambient pressure. At pressures lower than 2.05 GPa, the electrical resistivity in the whole range of temperature decreased drastically, but the semiconducting-like behavior was also observed. The sign of the temperature dependence of the thermoelectric power in La 1-x Sr x OBiS 2 was negative below room temperature. The results suggest that the carrier was exactly the electron.

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Selenium isotope effect in the layered bismuth chalcogenide superconductor LaO0.6F0.4

Cited by 36 publications

References 29 publications

Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Spin–orbit coupling, minimal model and potential Cooper-pairing from repulsion in BiS₂-superconductors

Hydrostatic Pressure Effect in Non-Doping LaOBiSSe and Hole-Doping La₁₋_xSr_xOBiS₂

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Selenium isotope effect in the layered bismuth chalcogenide superconductor LaO0.6F0.4

Cited by 36 publications

References 29 publications

Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Spin–orbit coupling, minimal model and potential Cooper-pairing from repulsion in BiS2-superconductors

Hydrostatic Pressure Effect in Non-Doping LaOBiSSe and Hole-Doping La1−xSrxOBiS2

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Spin–orbit coupling, minimal model and potential Cooper-pairing from repulsion in BiS₂-superconductors

Hydrostatic Pressure Effect in Non-Doping LaOBiSSe and Hole-Doping La₁₋_xSr_xOBiS₂