|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Evidence for Two Superconducting Gaps in $MgB_2$ | | X.K. Chen
; M.J. Konstantinovic
; J.C. Irwin
; D.D. Lawrie
; J.P. Franck
; | | Date: |
31 Mar 2001 | | Journal: | Phys. Rev. Lett. 87, 157002, (2001) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | We have measured the Raman spectra of polycrystalline MgB$_{2}$ from 25 {cm} to 1200 {cm}. When the temperature was decreased below the superconducting transition temperature $T_c$, we observed a superconductivity-induced redistribution in the electronic Raman continuum. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. Furthermore, we have analyzed the measured spectra using a quasi two-dimensional model in which two s-wave superconducting gaps open on two sheets of Fermi surface. For the gap values we have obtained $Delta_1 = 22 cm^{-1}$ (2.7 meV) and $Delta_2 = 50 cm^{-1}$ (6.2 meV). Our results suggest that a conventional phonon-mediated pairing mechanism occurs in the planar boron $sigma$ bands and is responsible for the superconductivity of MgB$_{2}$. | | Source: | arXiv, cond-mat/0104005 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER