Superconductivity of Metal Absorbed Hydrogen and its Isotope Effect
抄録
The variation in the superconducting critical temperature, Tc, between NbHx, PdHx and NbDx films, prepared by H-reactive sputtering at room temperature, were investigated. The prepared films were about 5000A in thickenss. The X-ray diffraction experiments were carried out and the lattice parameters, ao, were calculated. To obtain the value of Tc, the electrical resistance was measured. If we assume that the same composition in NbHx and NbDx correspond to the same lattice parameters, ao, then a pronounced normal isotope effect was observed. At ao =3.4A, hydrogen absorption reduces Tc by 2.8K while deuterium absorption reduces Tc by 3.9K. For PdHx, however, all the samples did not become superconductors above 1.4K, even for film which was sputtered in 100% hydrogen gas.
雑誌名
富山大学トリチウム科学センター研究報告 = Annual Report of Tritium Research Center, Toyama University
金属の水素吸収による超伝導とその同位体効果
annual_report7-5.pdf
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