Browsing by Author "Yasui, Y."

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  • An origin of good electrical conduction in La4BaCu5O13+δ
    (2015) Mori, De.; Asai, S.; Terasaki, I.; Okazaki, R.; Yasui, Y.; Parkkima, Outi; Karppinen, Maarit
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    We have prepared a set of polycrystalline samples of the metallic copper oxide La4BaCu5−xCoxO13+δ (0 ≤ x ≤ 0.35) and have measured the resistivity from 4 to 800 K. All the resistivities show metallic temperature dependence with a small magnitude less than 2 mΩ cm at 800 K, indicating that the metallic conduction is robust against impurities. The robust metallic conduction further suggests that this class of oxide is a promising candidate for electrical leads at high temperature, which might replace platinum. A detailed measurement and analysis on the Hall resistivity have revealed that at least two components are responsible for the electrical conduction, in which a large number of electrons of moderate mobility coexist with a much smaller number of holes of extremely high mobility. This large electron density well screens the impurity potential and retains the metallic conduction against 7% impurity doping.