Observation of superconductivity in thick amorphous MgxB1−x films

S. Okuma; S. Togo; K. Amemori

doi:10.1103/PhysRevB.67.172508

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Observation of superconductivity in thick amorphous MgxB1−x films

S. Okuma, S. Togo, K. Amemori

DOI 10.1103/PhysRevB.67.172508 · Physical Review B

T1

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Abstract

We report the observation of superconductivity in homogeneously disordered thick films of amorphous MgxB1−x with x=0.29−0.39. We find that the superconducting-transition temperature Tc changes smoothly as a function of x, exhibiting a peak (Tc≈6.1K) at x≈0.33 (≡xp). Seven films studied in this work are classified into two groups. For films with x<xp the slope of the critical field B0(T) where the dc resistivity vanishes is larger than that for films with x>~xp, indicating that there is a difference in the electronic and/or vortex states between the two groups.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgxB1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.1	Pressure not reported	onset
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
MoxSi1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown