Phase separation in carbon-doped MgB2 superconductors

I. Maurin, S. Margadonna, K. Prassides, T. Takenobu, T. Ito, D. H. Chi, Y. Iwasa, A. Fitch

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31 Citations (Scopus)

Abstract

High-resolution synchrotron X-ray powder diffraction measurements have been carried out on superconducting MgB2-xCx (0 ≤ x ≤ 0.1) phases. The carbon miscibility in the hexagonal AlB2-type structure is very small, x < 0.04. At higher carbon contents, macroscopic phase separation occurs leading to the coexistence of at least two phases, isostructural with the parent MgB2 compound. The coexisting phases differ mainly in their in-plane lattice constants, suggesting that boron is substituted by carbon in the boron layers, but in different concentrations. The multiphase samples still show a clear one-step superconducting transition and full shielding, χ = -1/4π.

Original languageEnglish
Pages (from-to)392-397
Number of pages6
JournalPhysica B: Condensed Matter
Volume318
Issue number4
DOIs
Publication statusPublished - 2002 Jun

Keywords

  • Carbon doping
  • MgB superconductor
  • Phase separation
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Maurin, I., Margadonna, S., Prassides, K., Takenobu, T., Ito, T., Chi, D. H., Iwasa, Y., & Fitch, A. (2002). Phase separation in carbon-doped MgB2 superconductors. Physica B: Condensed Matter, 318(4), 392-397. https://doi.org/10.1016/S0921-4526(02)00811-6