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Strong interaction between electrons and collective excitations in multiband superconductor MgB2
- Publication Year :
- 2015
-
Abstract
- We use a tunable laser ARPES to study the electronic properties of the prototypical multiband BCS superconductor MgB2. Our data reveal a strong renormalization of the dispersion (kink) at ~65 meV, which is caused by 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 binding energy of 10 meV. This excitation vanishes above Tc and is likely a signature of the elusive Leggett mode.<br />10 figs
- Subjects :
- Physics
Superconductivity
Condensed matter physics
Photoemission spectroscopy
Phonon
Condensed Matter - Superconductivity
Binding energy
Strong interaction
FOS: Physical sciences
Electronic structure
Condensed Matter Physics
Coupling (probability)
Electronic, Optical and Magnetic Materials
Superconductivity (cond-mat.supr-con)
Condensed Matter::Superconductivity
Quasiparticle
Condensed Matter::Strongly Correlated Electrons
Atomic physics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....16ecd3014b7e3aef252e04919a4f57a6