Structural and superconducting properties of MgB$_{2-x}$Be$_x$

Details Structural and superconducting properties of MgB$_{2-x}$Be$_x$ Structural and superconducting properties of MgB$_{2-x}$Be$_x$

2002-02-23

arxiv.org/abs/cond-mat/0202415v1

Physics

Condensed Matter

Superconductivity

3 pages,4 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.172503

We prepared MgB$_{2-x}$Be$_{x}$ ($x=0$, 0.2, 0.3, 0.4, and 0.6) samples where B is substituted with Be. MgB$_{2}$ structure is maintained up to $x=0.6$. In-plane and inter-plane lattice constants were found to decrease and increase, respectively. Superconducting transition temperature $T_{c}$ decreases with $x$. We found that the $T_{c}$ decrease is correlated with in-plane contraction but is insensitive to carrier doping, which is consistent with other substitution studies such as Mg$_{1-x}$Al$_{x}$B$_{2}$ and MgB$_{2-x}$C$_{x}$. Implication of this work is discussed in terms of the 2D nature of $\sigma $-band.

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