Compressibility of the MgB2 superconductor

K. Prassides, Y. Iwasa, T. Ito, Dam H. Chi, K. Uehara, E. Nishibori, M. Takata, S. Sakata, Y. Ohishi, O. Shimomura, T. Muranaka, J. Akimitsu

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Abstract

Considerable excitement has been caused recently by the discovery that the binary-boride system with stoichiometry MgB2 is superconducting at the remarkably high temperature of 39 K [J. Nagamatsu, N, Nakagawa, T. Muranaka, Y. Zenitani, and J. Akimitsu, Nature 410, 63 (2001)]. This potentially opens the way to even higher-Tc values in a new family of superconductors with unexpectedly simple composition and structure. The simplicity in the electronic and crystal structures could allow the understanding of the physics of high-Tc superconductivity without the presence of the multitude of complicated features, associated with the cuprates. Synchrotron x-ray diffraction was used to measure the isothermal compressibility of MgB2, revealing a stiff tightly packed incompressible solid with only moderate bonding anisotropy between intralayer and interlayer directions. These results, combined with the pressure evolution of the superconducting transition temperature, Tc, establish its relation to the B and Mg bonding distances over a broad range of values.

Original languageEnglish
Article number012509
Pages (from-to)125091-125094
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number1
Publication statusPublished - 2001 Aug 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Prassides, K., Iwasa, Y., Ito, T., Chi, D. H., Uehara, K., Nishibori, E., Takata, M., Sakata, S., Ohishi, Y., Shimomura, O., Muranaka, T., & Akimitsu, J. (2001). Compressibility of the MgB2 superconductor. Physical Review B - Condensed Matter and Materials Physics, 64(1), 125091-125094. [012509].