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Mechanical response of the flux lines in ceramic YBa2Cu3O7-

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Fil.: Luzuriaga, J. Comisión Nacional de Energía Atómica. Instituto Balseiro; Argentina; Universidad Nacional de Cuyo; Argentina; Ecole Politechnique Federal de Lausanne; Suiza
Fil.: Andre, M.-O. Ecole Politechnique Federal de Lausanne; Suiza
Fil.: Benoit, W. Ecole Politechnique Federal de Lausanne; Suiza

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Centro Atómico Bariloche

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eng

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We have studied the mechanical response of the flux-line lattice (FLL) in ceramic samples of YBa2Cu3O7 by means of a low-frequency forced pendulum. The internal friction and elastic modulus variation of the FLL have been measured as a function of temperature for different values of the applied stress. A somewhat different behavior was observed whether a zero-field-cooling or field-cooling procedure was followed. Measurements of the internal friction and elastic modulus as a function of the applied stress at constant temperature show amplitude-dependent dissipation, with a maximum dissipation at intermediate values of the stress. This dependence is well fitted by a rheological model of extended dry friction, if we restrict ourselves to the dissipation and modulus at fixed temperature. The agreement is not so good when attempting to extend the model to fit the temperature dependence.

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Physical Review B. Vol. 45, no. 21 (1992), p. 12492-12497

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