Abrupt change in the energy gap of superconducting Ba1−xKxFe2As2 single crystals with hole doping
W. Malaeb, T. Shimojima, Y. Ishida, K. Okazaki, Y. Ota, K. Ohgushi, K. Kihou, T. Saito, C. H. Lee, S. Ishida, M. Nakajima, S. Uchida, H. Fukazawa, Y. Kohori, A. Iyo, H. Eisaki, C.-T. Chen, S. Watanabe, H. Ikeda, S. Shin
DOI 10.1103/PhysRevB.86.165117 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1−xKxFe2As2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x≳ 0.6) while the inner and middle FS gaps roughly scale with Tc. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X2−Y2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
Similar papers
Experimental investigation of the suppressed superconducting gap and double-resonance mode in Ba1−xKxFe2As2
similarity 0.96S. Ideta et al.
Source status unknown — claims are unverified
Universality of superconducting gaps in overdoped Ba0.3K0.7Fe2As2 observed by angle-resolved photoemission spectroscopy
similarity 0.95K. Nakayama et al.
Source status unknown — claims are unverified
Abrupt change in the energy gap of superconducting Ba1-xKxFe2As2 single crystals with hole doping
similarity 0.95W. Malaeb et al. · 2012 · arXiv:1204.0326
Source status unknown — claims are unverified
Evidence for excluding the possibility of d-wave superconducting-gap symmetry in Ba-doped KFe2As2
similarity 0.94Y. Ota et al.
Source status unknown — claims are unverified
Electron-hole asymmetry in the superconductivity of doped BaFe2As2 seen via the rigid chemical-potential shift in photoemission
similarity 0.93M. Neupane et al.
Source status unknown — claims are unverified
Nonrigid band shift and nonmonotonic electronic structure changes upon doping in the normal state of the pnictide high-temperature superconductor Ba(Fe1−xCox)2As2
similarity 0.93Paolo Vilmercati et al.
Source status unknown — claims are unverified