Surface morphology and electronic structure in stoichiometric superconductor CaKFe4As4 probed by scanning tunneling microscopy/spectroscopy

Yu, X.Y.; Wei, Zhongxu; Zhao, Zhanyi; Xie, Tao; Liu, Chang; He, Ge; Chen, Qihong; Shan, Lei; Luo, Huiqian; Huan, Qing; Yuan, Jie; Jin, Kui

doi:10.1007/s11433-021-1804-7

Cited by 11 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The dark area in the upper right corner is the exposed SrTiO 3 substrate. The apparent height of the step between FeSe and SrTiO 3 is ∼ 660 pm at a V s of 1 V, which is slightly larger than the out-of-plane lattice constant of FeSe (550 pm) due to the varied density of states [34]. This edge is along the (11) direction, as judged from the atomically resolved Se lattice structure shown in the inset image.…”

Section: Resultsmentioning

confidence: 90%

Identifying $s$-wave pairing symmetry in single-layer FeSe from topologically trivial edge states

Wei¹,

Qin²,

Ding³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Determining the pairing symmetry of single-layer FeSe on SrTiO 3 is the key to understanding the enhanced pairing mechanism; furthermore, it guides exploring new superconductors with high transition temperatures (T c ). Despite significant efforts, it remains controversial whether the symmetry is the sign-preserving sor the sign-changed s ± -wave. Here, we investigate the pairing symmetry of single-layer FeSe from a topological point of view. Using low-temperature scanning tunneling microscopy/spectroscopy, we have systematically characterized the superconducting states at isolated edges and corners of single-layer FeSe. The tunneling spectra collected at edges and corners exhibit full gap and substantial dip, respectively, demonstrating the absence of topologically non-trivial edge/corner modes. According to the theoretical calculation, these spectroscopic features are strong evidence for the sign-preserving s-wave pairing.

show abstract

Section: Resultsmentioning

confidence: 90%

Identifying $s$-wave pairing symmetry in single-layer FeSe from topologically trivial edge states

Wei¹,

Qin²,

Ding³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The dark area in the upper right corner is the exposed SrTiO3 substrate. The apparent height of the step between FeSe and SrTiO3 is ~ 660 pm at a sample bias (Vs) of 1 V, which is slightly larger than the out-of-plane lattice constant of FeSe (550 pm) due to the varied density of states 34 . This edge is along the (11) direction, as judged from the atomically resolved Se lattice structure shown in the inset image.…”

Section: Main Textmentioning

confidence: 92%

Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states

Wei

Qin

Ding

et al. 2023

Preprint

View full text Add to dashboard Cite

Determining the pairing symmetry of single-layer FeSe on SrTiO3 is the key to understanding the enhanced pairing mechanism; furthermore, it guides exploring new superconductors with high transition temperatures (Tc). Despite significant efforts, it remains controversial whether the symmetry is the sign-preserving s- or the sign-changed s±-wave. Here, we investigate the pairing symmetry of single-layer FeSe from a topological point of view. Using low-temperature scanning tunneling microscopy/spectroscopy, we have systematically characterized the superconducting states at isolated edges and corners of single-layer FeSe. The tunneling spectra collected at edges and corners exhibit full gap and substantial dip, respectively, demonstrating the absence of topologically non-trivial edge/corner modes. According to the theoretical calculation, these spectroscopic features are strong evidence for the sign-preserving s-wave pairing.

show abstract

“…[2,9, [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] . 尤其, 近十几年来随着铁基超导体的发现及各种实验技术的发展 [31][32][33][34][35][36][37] , 为铜氧化物也会提高超导转变温度. 铜氧化物和铁基超导体的最高转变温度都是利用这一策略成功实现的 [31,43,44] .…”

unclassified

Pressure-induced superconducting-insulating phase transition in copper oxide superconductors

ZHAO,

ZHOU,

GUO

et al. 2023

Sci. Sin.-Phys. Mech. Astron.

View full text Add to dashboard Cite

Surface morphology and electronic structure in stoichiometric superconductor CaKFe4As4 probed by scanning tunneling microscopy/spectroscopy

Cited by 11 publications

References 50 publications

Identifying $s$-wave pairing symmetry in single-layer FeSe from topologically trivial edge states

Identifying $s$-wave pairing symmetry in single-layer FeSe from topologically trivial edge states

Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states

Pressure-induced superconducting-insulating phase transition in copper oxide superconductors

Contact Info

Product

Resources

About