Comparative ARPES studies of LaOxF1−xBiS2(x = 0.23 and 0.46)

The natural periodic stacking of symmetry-inequivalent planes in layered compounds can lead to the formation of natural superlattices; albeit close in total energy, (thus in their thermodynamic stability), such polytype superlattices can exhibit different structural symmetries, thus have markedly different electronic properties which can in turn be used as "structural markers". We illustrate this general principle on the layered LaOBiS 2 compound where density-functional theory (DFT) calculations on the (BiS 2 )/(LaO)/(BiS 2 ) polytype superlattices reveal both qualitatively and quantitatively distinct electronic structure markers associated with the Rashba physics, yet the total energies are only ~ 0.1 meV apart.This opens the exciting possibility of identifying subtle structural features via electronic markers. We show that the pattern of removal of band degeneracies in different polytypes by the different forms of symmetry breaking leads to new Rashba "mini gaps" with characteristic Rashba parameters that can be determined from spectroscopy, thereby narrowing down the physically possible polytypes. By identifying these distinct DFT-predicted fingerprints via ARPES measurements on LaBiOS 2 we found the dominant polytype with small amounts of mixtures of other polytypes. This conclusion, consistent with neutron scattering results, establishes ARPES detection of theoretically established electronic markers as a powerful tool to delineate energetically quasidegenerate polytypes.2

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Predicted electronic markers for polytypes of LaOBiS2 examined via angle-resolved photoemission spectroscopy

Zhou

Liu

Waugh

et al. 2017

Phys. Rev. B

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The Superconducting Mechanism in BiS2-Based Superconductors: A Comprehensive Review with Focus on Point-Contact Spectroscopy

Romano,

Pelella,

Di Bartolomeo

et al. 2024

Nanomaterials

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The family of BiS2-based superconductors has attracted considerable attention since their discovery in 2012 due to the unique structural and electronic properties of these materials. Several experimental and theoretical studies have been performed to explore the basic properties and the underlying mechanism for superconductivity. In this review, we discuss the current understanding of pairing symmetry in BiS2-based superconductors and particularly the role of point-contact spectroscopy in unravelling the mechanism underlying the superconducting state. We also review experimental results obtained with different techniques including angle-resolved photoemission spectroscopy, scanning tunnelling spectroscopy, specific heat measurements, and nuclear magnetic resonance spectroscopy. The integration of experimental results and theoretical predictions sheds light on the complex interplay between electronic correlations, spin fluctuations, and Fermi surface topology in determining the coupling mechanism. Finally, we highlight recent advances and future directions in the field of BiS2-based superconductors, underlining the potential technological applications.

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Anomalous Transport Properties in BiS₂-based Superconductors LnO₁₋_xF_xBiS₂ (Ln = Nd, La-Sm)

et al. 2019

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We report the electronic properties of the layered bismuth-based sulfide superconductors NdO 1−x F x BiS 2 (x = 0.25, 0.4, and 0.5) and La 1−y Sm y O 0.5 F 0.5 BiS 2 (y = 0.1 -0.7), which have been studied by investigation of their transport properties and X-ray diffraction. In the lightly carrier-doped NdO 1−x F x BiS 2 (x = 0.25 and 0.4) and La 1−y Sm y O 0.5 F 0.5 BiS 2 (y = 0.3 and 0.4), the resistivity and Hall coefficient exhibit anomalous temperature dependences below T CDW ∼ 130 and 200 K, respectively, suggesting the formation of an energy gap on the Fermi surface associated with charge-density wave (CDW). In NdO 1−x F x BiS 2 (x = 0.25), the bond angles and bond length of the Bi-S pentahedron change their temperature dependences below ∼ 200 K, suggesting that a lattice instability related to the Bi-S pentahedron exists below ∼ 200 K, which is much higher than T CDW . These results indicate that the lattice instability of the Bi-S pentahedron can trigger a CDW transition in the low-carrier region of BiS 2 superconductors.

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Comparative ARPES studies of LaO_xF_1−xBiS₂(x = 0.23 and 0.46)

Cited by 4 publications

References 19 publications

Predicted electronic markers for polytypes of LaOBiS2 examined via angle-resolved photoemission spectroscopy

Predicted electronic markers for polytypes of LaOBiS2 examined via angle-resolved photoemission spectroscopy

The Superconducting Mechanism in BiS2-Based Superconductors: A Comprehensive Review with Focus on Point-Contact Spectroscopy

Anomalous Transport Properties in BiS₂-based Superconductors LnO₁₋_xF_xBiS₂ (Ln = Nd, La-Sm)

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Comparative ARPES studies of LaOxF1−xBiS2(x = 0.23 and 0.46)

Cited by 4 publications

References 19 publications

Predicted electronic markers for polytypes of LaOBiS2 examined via angle-resolved photoemission spectroscopy

Predicted electronic markers for polytypes of LaOBiS2 examined via angle-resolved photoemission spectroscopy

The Superconducting Mechanism in BiS2-Based Superconductors: A Comprehensive Review with Focus on Point-Contact Spectroscopy

Anomalous Transport Properties in BiS2-based Superconductors LnO1−xFxBiS2 (Ln = Nd, La-Sm)

Contact Info

Product

Resources

About

Comparative ARPES studies of LaO_xF_1−xBiS₂(x = 0.23 and 0.46)

Anomalous Transport Properties in BiS₂-based Superconductors LnO₁₋_xF_xBiS₂ (Ln = Nd, La-Sm)