Phase inhomogeneities and lattice expansion near Tc in the Mg11B2 superconductor

S. Margadonna, T. Muranaka, K. Prassides, I. Maurin, K. Brigatti, R. M. Ibberson, M. Arai, M. Takata, J. Akimitsu

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29 Citations (Scopus)

Abstract

High-resolution powder neutron diffraction has been used to study the crystal structure of the Mg11B2 superconductor (Tc = 39.2 K) prepared at high pressure in the temperature range 2 to 293 K. The experimental data provide clear evidence of temperature-independent phase inhomogeneity, which was modelled by coexisting Mg1+δB2 phases. Precise structural information for temperatures near Tc also reveals extremely small volume and c-axis discontinuities, consistent with the existence of a specific heat anomaly at Tc.

Original languageEnglish
Pages (from-to)L795-L802
JournalJournal of Physics Condensed Matter
Volume13
Issue number35
DOIs
Publication statusPublished - Sep 3 2001
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Margadonna, S., Muranaka, T., Prassides, K., Maurin, I., Brigatti, K., Ibberson, R. M., Arai, M., Takata, M., & Akimitsu, J. (2001). Phase inhomogeneities and lattice expansion near Tc in the Mg11B2 superconductor. Journal of Physics Condensed Matter, 13(35), L795-L802. https://doi.org/10.1088/0953-8984/13/35/101