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26 April 2024 |
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de Haas-van Alphen effect in single crystal MgB2 | | E A Yell
; J R Cooper
; A Carrington
; N E Hussey
; P J Meeson
; S Lee
; A Yamamoto
; S Tajima
; | | Date: |
27 May 2002 | | Journal: | Phys Rev Lett, 88 (21), 217002 | | Abstract: | We report observations of quantum oscillations in single crystals of the high temperature superconductor MgB2. Three de Haas-van Alphen frequencies are clearly resolved. Comparison with band structure calculations strongly suggests that two of these come from a single warped Fermi surface tube along the c direction, and that the third arises from cylindrical sections of an in-plane honeycomb network. The measured values of the effective mass range from (0.44-0.68)m(e). By comparing these to calculated band masses, we find that the electron-phonon coupling strength lambda is a factor of approximately 3 larger for the c-axis tube orbits than for the in-plane network orbit, in accord with recent microscopic calculations. | | Source: | PubMed, pmid12059494 | | Services: | Forum | Review | Favorites | |
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