Superconducting Transition Temperature of Fine A-15 V–Si Alloy Particles
1986 年 55 巻 8 号 p. 2790-2797
詳細
1986 年 55 巻 8 号 p. 2790-2797
The superconducting transition temperature (Tc) of the fine particles of V–Si alloys with A-15 structure is studied. The average diameters range from 40 to 8000 Å. The Tc of the particles with the stoichiometric composition smaller than 170 Å is about 6∼7 K, which is less than half of that of the bulk material. The Tc of the particles with 22.0 and 20.0 at%Si is below 2.0 K, and increases to about 3 K after the annealing at 780°C for 4 hours. The large reduction in Tc is interpreted in terms of the broadening of the peak in the electronic density of states caused by the break-down of the translational symmetry in the particles.
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