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27 April 2024 |
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Two-band superconductivity in MgB2 | | M Iavarone
; G Karapetrov
; A E Koshelev
; W K Kwok
; G W Crabtree
; D G Hinks
; W N Kang
; Eun-Mi Choi
; Hyun Jung Kim
; Hyeong-Jin Kim
; S I Lee
; | | Date: |
28 Oct 2002 | | Journal: | Phys Rev Lett, 89 (18), 187002 | | Abstract: | The study of the anisotropic superconductor MgB2 using a combination of scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at Delta(1)=2.3 meV and Delta(2)=7.1 meV at 4.2 K. Different spectral weights of the partial superconducting density of states are a reflection of different tunneling directions in this multiband system. Temperature evolution of the tunneling spectra follows the BCS scenario [Phys. Rev. Lett. 3, 552 (1959)]] with both gaps vanishing at the bulk T(c). The data confirm the importance of Fermi-surface sheet dependent superconductivity in MgB2 proposed in the multigap model by Liu et al. [Phys. Rev. Lett. 87, 087005 (2001)]]. | | Source: | PubMed, pmid12398628 | | Services: | Forum | Review | Favorites | |
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