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Superconductivity, Superstructure, and Structure Anomalies in Mg1-XAlxB2

  • J. Q. Li (a1), L. Li (a1) (a2), F. M. Liu (a1) (a3), C. Dong (a1), J. Y. Xiang (a1) and Z. X. Zhao (a1)...

Abstract

The presence of a superstructure is identified to play a key role for the modifications in both superconductivity and structure transitions in the Mg1-xAlxB2 system. This superstructure occurs along the c-axis direction, and can be well interpreted by Al-layer ordering. The optimal composition of the superstructure phase is MgAlB4, a superconductor with Tc ∼12K. Raman spectrum of MgAlB4 gives rise to a sharp peak at around 941cm−1. Brief diagrams illustrating the superconductivity and structural features of Mg1-xAlxB2 (0≤x≤1) materials are presented.

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