酸化物高温超伝導体を伝わる超音波の速度および吸収に関する研究

概要

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Ultrasonic velocity and absorption have been measured in high-Tc Oxide Superconductors YBa(2)Cu(3)O(y),ErBa(2)Cu(3)O(y) and Bi(2.1 5)Sr(1.8 5)CaCu(2)O(y). samples were prepared by a solid-state reaction method. A pu;se-echo overlap method was used to measure the ultrasonic velocity v at room temperature. The absorption for the oxide superconductors is larger than that for the metals. The values of v obtained are 2500-3500-m・s(-1) for Bi(2.1 5)Sr(1.8 5)CaCu(2)O(y). the velocity decreases with increasing porosity. The v values are nearly the same for quenched and non-quenched samples. The value of v for Ag-doped BSCOO samples is smaller than that for undoped samples. This means that the Ag addition may change the electicity for BSCOO samples.
豊田工業高等専門学校の論文
1992-12-01