Momentum dependence of the superconducting gap and in-gap states in multiband superconductor
Abstract
We use tunable laser-based angle-resolved photoemission spectroscopy to study the electronic structure of the multiband superconductor MgB2. These results form the baseline for detailed studies of superconductivity in multiband systems. We find that the magnitude of the superconducting gap on both σ bands follows a BCS-like variation with temperature with Δ0 ~ 7meV. Furthermore, the value of the gap is isotropic within experimental uncertainty and in agreement with a pure s-wave pairing symmetry. We observe in-gap states confined to kF of the σ band that occur at some locations of the sample surface. As a result, the energy of this excitation, ~ 3 meV, was found to be somewhat larger than the previously reported gap on π Fermi sheet and therefore we cannot exclude the possibility of interband scattering as its origin.
- Authors:
-
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1227380
- Alternate Identifier(s):
- OSTI ID: 1198619
- Report Number(s):
- IS-J-8675
Journal ID: ISSN 1098-0121; PRBMDO
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 21; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Bud'ko, S. L., Canfield, P. C., and Kaminski, Adam. Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.91.214519.
Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Bud'ko, S. L., Canfield, P. C., & Kaminski, Adam. Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor. United States. https://doi.org/10.1103/PhysRevB.91.214519
Mou, Daixiang, Jiang, Rui, Taufour, Valentin, Bud'ko, S. L., Canfield, P. C., and Kaminski, Adam. Mon .
"Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor". United States. https://doi.org/10.1103/PhysRevB.91.214519. https://www.osti.gov/servlets/purl/1227380.
@article{osti_1227380,
title = {Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor},
author = {Mou, Daixiang and Jiang, Rui and Taufour, Valentin and Bud'ko, S. L. and Canfield, P. C. and Kaminski, Adam},
abstractNote = {We use tunable laser-based angle-resolved photoemission spectroscopy to study the electronic structure of the multiband superconductor MgB2. These results form the baseline for detailed studies of superconductivity in multiband systems. We find that the magnitude of the superconducting gap on both σ bands follows a BCS-like variation with temperature with Δ0 ~ 7meV. Furthermore, the value of the gap is isotropic within experimental uncertainty and in agreement with a pure s-wave pairing symmetry. We observe in-gap states confined to kF of the σ band that occur at some locations of the sample surface. As a result, the energy of this excitation, ~ 3 meV, was found to be somewhat larger than the previously reported gap on π Fermi sheet and therefore we cannot exclude the possibility of interband scattering as its origin.},
doi = {10.1103/PhysRevB.91.214519},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 21,
volume = 91,
place = {United States},
year = {Mon Jun 29 00:00:00 EDT 2015},
month = {Mon Jun 29 00:00:00 EDT 2015}
}
Web of Science
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Works referencing / citing this record:
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