Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry
We report measurements on MgB2 up to ∼40 GPa. Increasing pressure yields a monotonous decrease of the lattice parameters and of the c/a ratio, but no structural transition down to parameters smaller than those of AlB2. The transition superconducting temperature also decreases with temperature in a s...
| Հիմնական հեղինակներ: | , , , , , , , , , , |
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| Ձևաչափ: | Journal article |
| Լեզու: | English |
| Հրապարակվել է: |
2001
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| _version_ | 1826281390881112064 |
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| author | Bordet, P Mezouar, M Nunez-Regueiro, M Monteverde, M Nunez-Regueiro, MD Rogado, N Regan, K Hayward, M He, T Loureiro, S Cava, R |
| author_facet | Bordet, P Mezouar, M Nunez-Regueiro, M Monteverde, M Nunez-Regueiro, MD Rogado, N Regan, K Hayward, M He, T Loureiro, S Cava, R |
| author_sort | Bordet, P |
| collection | OXFORD |
| description | We report measurements on MgB2 up to ∼40 GPa. Increasing pressure yields a monotonous decrease of the lattice parameters and of the c/a ratio, but no structural transition down to parameters smaller than those of AlB2. The transition superconducting temperature also decreases with temperature in a sample-dependent way. The results are explained by an increase of the filling of the two-dimensional pxy bands with pressure, the Mg stoichiometry determining the starting position of the Fermi level. Our measurements indicate that these hole bands are the relevant ones for superconductivity. |
| first_indexed | 2024-03-07T00:28:06Z |
| format | Journal article |
| id | oxford-uuid:7ed035e6-b81c-4b04-93c1-5f8cdedca492 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:28:06Z |
| publishDate | 2001 |
| record_format | dspace |
| spelling | oxford-uuid:7ed035e6-b81c-4b04-93c1-5f8cdedca4922022-03-26T21:12:37ZAbsence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometryJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7ed035e6-b81c-4b04-93c1-5f8cdedca492EnglishSymplectic Elements at Oxford2001Bordet, PMezouar, MNunez-Regueiro, MMonteverde, MNunez-Regueiro, MDRogado, NRegan, KHayward, MHe, TLoureiro, SCava, RWe report measurements on MgB2 up to ∼40 GPa. Increasing pressure yields a monotonous decrease of the lattice parameters and of the c/a ratio, but no structural transition down to parameters smaller than those of AlB2. The transition superconducting temperature also decreases with temperature in a sample-dependent way. The results are explained by an increase of the filling of the two-dimensional pxy bands with pressure, the Mg stoichiometry determining the starting position of the Fermi level. Our measurements indicate that these hole bands are the relevant ones for superconductivity. |
| spellingShingle | Bordet, P Mezouar, M Nunez-Regueiro, M Monteverde, M Nunez-Regueiro, MD Rogado, N Regan, K Hayward, M He, T Loureiro, S Cava, R Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry |
| title | Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry |
| title_full | Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry |
| title_fullStr | Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry |
| title_full_unstemmed | Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry |
| title_short | Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry |
| title_sort | absence of a structural transition up to 40 gpa in mgb2 and the relevance of magnesium nonstoichiometry |
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