Journal article
+ 1 other files
Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$
-
Xu, Bing
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
-
Cappelluti, E.
Istituto di Struttura della Materia, Trieste, Italy
-
Benfatto, Larra
ISC-CNR and Department of Physics, Sapienza University of Rome, Italy
-
Mallett, Benjamin P. P.
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland - The Photon Factory, Department of Physics, University of Auckland, New Zealand
-
Marsik, Premysl
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
-
Sheveleva, Evgeniia
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
-
Lyzwa, Fryderyk
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
-
Wolf, Thomas
Institute of Solid State Physics, Karlsruhe Institute of Technology, Germany
-
Yang, Rui
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
-
Qiu, X. G.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
-
Dai, Y. M.
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, China
-
Wen, H. H.
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, China
-
Lobo, R. P. S. M.
LPEM, ESPCI Paris, PSL University, CNRS, Paris, France - Sorbonne Université, CNRS, LPEM, Paris, France
-
Bernhard, Christian
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
Show more…
Published in:
- Physical Review Letters. - 2019, vol. 122, no. 21, p. 217002
English
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.
-
Faculty
- Faculté des sciences et de médecine
-
Department
- Département de Physique
-
Language
-
-
Classification
-
Physics
-
License
-
License undefined
-
Identifiers
-
-
Persistent URL
-
https://folia.unifr.ch/unifr/documents/307997
Other files
Statistics
Document views: 57
File downloads:
- ber_sfe.pdf: 101
- ber_sfe_sm.pdf: 81