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Friction coefficient of the ceramic YBa2Cu3O7−<i>δ</i> in the superconducting state

B. I. VerkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovL. S. PalatnikV. I. Lenin Polytechnical Institute, KharkovElena A. OstrovskayaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov

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The friction coefficients of the high-temperature superconducting ceramic YBa2Cu3O7−δ are studied in the interval of normal loads from 2.5 to 25 N at temperatures between 77 and 293 K. A comparison is made with the friction coefficients of ordinary superconductors and antifriction materials. It is found that in the superconducting state, the HTS of the ceramic YBa2Cu3O7−δ is characterized by a very low friction coefficient (f = 0.02).

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