Scaling of the Fano Effect of the In-Plane Fe-As Phonon and the Superconducting Critical Temperature in Ba1−xKxFe2As2
B. Xu, E. Cappelluti, L. Benfatto, B. P. P. Mallett, P. Marsik, E. Sheveleva, F. Lyzwa, Th. Wolf, R. Yang, X. G. Qiu, Y. M. Dai, H. H. Wen, R. P. S. M. Lobo, C. Bernhard
DOI 10.1103/PhysRevLett.122.217002 · Physical Review Letters
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
By means of infrared spectroscopy, we determine the temperature-doping phase diagram of the Fano effect for the in-plane Fe-As stretching mode in Ba1−xKxFe2As2. The Fano parameter 1/q2, which is a measure of the phonon coupling to the electronic particle-hole continuum, shows a remarkable sensitivity to the magnetic and structural orderings at low temperatures. Most strikingly, at elevated temperatures in the paramagnetic tetragonal state we observe a linear correlation between 1/q2 and the superconducting critical temperature Tc. Based on theoretical calculations and symmetry considerations, we identify the relevant interband transitions that are coupled to the Fe-As mode. In particular, we show that a sizable xy orbital component at the Fermi level is fundamental for the Fano effect and, thus, possibly also for the superconducting pairing.
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. | — | Pressure not reported | unknown |
Similar papers
Measurements of the Anisotropic In-Plane Resistivity of Underdoped FeAs-Based Pnictide Superconductors
similarity 0.95J. J. Ying et al.
Source status unknown — claims are unverified
Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in BaKFeAs
similarity 0.94B. Xu et al. · 2018 · arXiv:1810.10230
Source status unknown — claims are unverified
Roles of multiband effects and electron-hole asymmetry in the superconductivity and normal-state properties of Ba(Fe1−xCox)2As2
similarity 0.93Lei Fang et al.
Source status unknown — claims are unverified
Impurity effects on the normal-state transport properties of Ba0.5K0.5Fe2As2 superconductors
similarity 0.93Jun Li et al.
Source status unknown — claims are unverified
Doping dependence of the critical fluctuation regime in the Fe-based superconductor Ba1−xKxFe2As2
similarity 0.93Jianqiang Hou et al.
Source status unknown — claims are unverified
Experimental investigation of the suppressed superconducting gap and double-resonance mode in Ba1−xKxFe2As2
similarity 0.93S. Ideta et al.
Source status unknown — claims are unverified