Strong interaction between electrons and collective excitations in the multiband superconductor MgB2

Mou, Daixiang; Jiang, Rui; Taufour, Valentin; Flint, Rebecca; Bud'ko, S. L.; Canfield, P. C.; Wen, J. S.; Xu, Z. J.; Gu, Genda; Kaminski, Adam

doi:10.1103/PhysRevB.91.140502

Title: Strong interaction between electrons and collective excitations in the multiband superconductor ${MgB}_{2}$

Journal Article · Wed Apr 08 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.140502· OSTI ID:1227294

Mou, Daixiang ^[1]; Jiang, Rui ^[1]; Taufour, Valentin ^[1]; Flint, Rebecca ^[1]; Bud'ko, S. L. ^[1]; Canfield, P. C. ^[1]; Wen, J. S. ^[2]; Xu, Z. J. ^[2]; Gu, Genda ^[2]; Kaminski, Adam ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

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 E_2g phonon mode. In contrast to cuprates, the 65 meV kink in MgB₂ does not change significantly across T_c. More interestingly, we observe strong coupling to a second, lower energy collective mode at a binding energy of 10 meV. As a result, this excitation vanishes above T_c and is likely a signature of the elusive Leggett mode.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358; AC02-98CH10886

OSTI ID:: 1227294

Alternate ID(s):: OSTI ID: 1179364

Report Number(s):: IS-J-8612; PRBMDO

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 14; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Self-Consistent Two-Gap Description of MgB2 Superconductor Kim, Hyunsoo; Cho, Kyuil; Tanatar, Makariy A. Symmetry, Vol. 11, Issue 8 https://doi.org/10.3390/sym11081012	journal	August 2019

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