de Haas–van Alphen effect investigation of the electronic structure of Al-substituted MgB2
A. Carrington, J. D. Fletcher, J. R. Cooper, O. J. Taylor, L. Balicas, N. D. Zhigadlo, S. M. Kazakov, J. Karpinski, J. P. H. Charmant, J. Kortus
DOI 10.1103/PhysRevB.72.060507 · Physical Review B
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Abstract
We report a de Haas–van Alphen (dHvA) study of the electronic structure of Al-doped crystals of MgB2. We have measured crystals with ∼7.5% Al, which have a Tc of 33.6 K (∼14% lower than pure MgB2). dHvA frequencies for the σ-tube orbits in the doped samples are lower than in pure MgB2, implying a 16±2% reduction in the number of holes in this sheet of Fermi surface. The mass of the quasiparticles on the larger σ orbit is lighter than the pure case indicating a reduction in electron-phonon coupling constant λ. These observations are compared with band-structure calculations, and found to be in excellent agreement.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Mg1-xAlx(B1-yCy)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.5 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.3 | Pressure not reported | onset |
| Mg0.921Al0.079B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33.6 | Pressure not reported | onset |
| Mg0.926Al0.074B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33.6 | Pressure not reported | onset |
| Mg0.921Al0.079B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.4 | Pressure not reported | onset |
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