Title
Strong interaction between electrons and collective excitations in the multiband superconductor MgB2
Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
4-1-2015
Journal or Book Title
Physical Review B
Volume
91
Issue
14
First Page
140502(R)
DOI
10.1103/PhysRevB.91.140502
Abstract
We use a tunable laser angle-resolved photoemission spectroscopy to study the electronic properties of the prototypical multiband BCS superconductor MgB2. Our data reveal a strong renormalization of the dispersion (kink) at ∼65meV, which is caused by the coupling of electrons to the E2g phonon mode. In contrast to cuprates, the 65 meV kink in MgB2 does not change significantly across Tc. More interestingly, we observe strong coupling to a second, lower energy collective mode at a binding energy of 10 meV. This excitation vanishes above Tc and is likely a signature of the elusive Leggett mode.
Copyright Owner
American Physical Society
Copyright Date
2015
Language
en
File Format
application/pdf
Recommended Citation
Mou, Daixiang; Jiang, Rui; Taufour, Valentin; Flint, Rebecca; Bud’ko, Sergey L.; Canfield, Paul C.; Wen, J. S.; Xu, Z. J.; Gu, Genda; and Kaminski, Adam, "Strong interaction between electrons and collective excitations in the multiband superconductor MgB2" (2015). Physics and Astronomy Publications. 593.
https://lib.dr.iastate.edu/physastro_pubs/593
Comments
This article is published as Mou, Daixiang, Rui Jiang, Valentin Taufour, Rebecca Flint, S. L. Bud'ko, P. C. Canfield, J. S. Wen, Z. J. Xu, Genda Gu, and Adam Kaminski. "Strong interaction between electrons and collective excitations in the multiband superconductor MgB 2." Physical Review B 91, no. 14 (2015): 140502. DOI: 10.1103/PhysRevB.91.140502. Posted with permission.