Absence of a structural transition up to 40 GPa in MgB2 and the relevance of magnesium nonstoichiometry

P. Bordet; M. Mezouar; M. Núñez-Regueiro; M. Monteverde; M. D. Núñez-Regueiro; N. Rogado; K. A. Regan; M. A. Hayward; T. He; S. M. Loureiro; R. J. Cava

Absence of a structural transition up to 40 GPa in MgB₂ and the relevance of magnesium nonstoichiometry

P. Bordet, M. Mezouar, M. Núñez-Regueiro, M. Monteverde, M. D. Núñez-Regueiro, N. Rogado, K. A. Regan, M. A. Hayward, T. He, S. M. Loureiro, R. J. Cava

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49 Scopus citations

Abstract

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 p_xy 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.

Original language	English (US)
Article number	172502
Pages (from-to)	1725021-1725024
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	17
State	Published - Nov 1 2001

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

Bordet, P., Mezouar, M., Núñez-Regueiro, M., Monteverde, M., Núñez-Regueiro, M. D., Rogado, N., Regan, K. A., Hayward, M. A., He, T., Loureiro, S. M., & Cava, R. J. (2001). Absence of a structural transition up to 40 GPa in MgB₂ and the relevance of magnesium nonstoichiometry. Physical Review B - Condensed Matter and Materials Physics, 64(17), 1725021-1725024. Article 172502.

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abstract = "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.",

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AU - Bordet, P.

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AU - Monteverde, M.

AU - Núñez-Regueiro, M. D.

AU - Rogado, N.

AU - Regan, K. A.

AU - Hayward, M. A.

AU - He, T.

AU - Loureiro, S. M.

AU - Cava, R. J.

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N2 - 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.

AB - 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.

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Absence of a structural transition up to 40 GPa in MgB₂ and the relevance of magnesium nonstoichiometry

Abstract

All Science Journal Classification (ASJC) codes

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