Compressibility of the MgB2 superconductor

Article

关键词: PRESSURE-DEPENDENCE;    MAGNESIUM;    BORON;   

DOI  :  10.1103/PhysRevB.64.012509

来源: SCIE

【 摘 要 】

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-T-c 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-T-c 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, T-c, establish its relation to the B and Mg bonding distances over a broad range of values.

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