Physics – Condensed Matter – Superconductivity
Scientific paper
2001-04-19
Phy. Rev. B 65, 214536(2002)
Physics
Condensed Matter
Superconductivity
15 pages, 7 figures
Scientific paper
10.1103/PhysRevB.65.214536
The superconducting and structural properties of a series of Mg1-xAlxB2 samples have been investigated. X-ray diffraction results confirmed the existence of a structural transition associated with the significant change in inter-boron layer distance as reported previously by Slusky et al. Moreover,transmission-electron-microscopy observations revealed the existence of a superstructure with doubled lattice constant along the c-axis direction. We propose that this superstructure is essentially related to the structural transition. The modifications of superconducting transition temperature Tc, the normal state resistivity, and the upper critical field Bc2 by Al doping are discussed in terms of Al-substitution induced changes in the electronic structure at the Fermi energy.
Che Guang-Can
Chen Haibin
Dong Cailing
Lang P. L.
Li Jing-Qian
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