Structural and superconducting properties of MgB2−xBex

J. S. Ahn; Young-Jin Kim; M.-S. Kim; S.-I. Lee; E. J. Choi

doi:10.1103/PhysRevB.65.172503

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Structural and superconducting properties of MgB2−xBex

J. S. Ahn, Young-Jin Kim, M.-S. Kim, S.-I. Lee, E. J. Choi

DOI 10.1103/PhysRevB.65.172503 · Physical Review B

T1

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Abstract

We prepared MgB2−xBex (x=0, 0.2, 0.3, 0.4, and 0.6) samples where B is substituted with Be. MgB2 structure is maintained up to x=0.6. In-plane and interplane lattice constants were found to decrease and increase, respectively. The superconducting transition temperature Tc decreases with x. We found that the Tc decrease is correlated with in-plane contraction but is insensitive to carrier doping, which is consistent with other substitution studies such as Mg1−xAlxB2 and MgB2−xCx. Implication of this work is discussed in terms of the two-dimensional nature of the σ band.

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
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure unresolved	onset
MgB1.8Be0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	onset
MgB1.7Be0.3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	onset
MgB1.6Be0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	onset
MgB1.4Be0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	onset