Superconducting properties and c-axis superstructure of Mg1−xAlxB2

J. Y. Xiang; D. N. Zheng; J. Q. Li; L. Li; P. L. Lang; H. Chen; C. Dong; G. C. Che; Z. A. Ren; H. H. Qi; H. Y. Tian; Y. M. Ni; Z. X. Zhao

doi:10.1103/PhysRevB.65.214536

Superconducting properties and c-axis superstructure of Mg1−xAlxB2

J. Y. Xiang, D. N. Zheng, J. Q. Li, L. Li, P. L. Lang, H. Chen, C. Dong, G. C. Che, Z. A. Ren, H. H. Qi, H. Y. Tian, Y. M. Ni, Z. X. Zhao

DOI 10.1103/PhysRevB.65.214536 · Physical Review B

T1

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Abstract

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 a significant change in interboron 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 probably related to the structural transition. The modifications of the superconducting transition temperature Tc, the normal-state resistivity, and the upper critical field Bc2(0) by Al doping are discussed in terms of Al-substitution-induced changes in the electronic structure at the Fermi energy.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
Mg1-xAlxB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown