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Superconductivity, Superstructure, and Structure Anomalies in Mg1-XAlxB2

Published online by Cambridge University Press:  18 March 2011

J. Q. Li,
L. Li,
F. M. Liu,
C. Dong,
J. Y. Xiang and
Z. X. Zhao
J. Q. Li
Affiliation:
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China
L. Li
Affiliation:
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. ChinaDepartment of Physics, Ningxia University, Yinchuan, Ningxia 750021, P.R. China.
F. M. Liu
Affiliation:
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. ChinaCenter for Material Physics and Chemistry, Beijing University of Aeronautics & Astronautics, Beijing 100083, P. R. China.
C. Dong
Affiliation:
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China
J. Y. Xiang
Affiliation:
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China
Z. X. Zhao
Affiliation:
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China
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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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References

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