Abstract Elastic energy dissipation measurements were carried out using the vibrating reed and torsional pendulum techniques on polycrystalline YBa2Cu3O7-x specimens in different stoichiometric conditions. In the 300–900 K range two relaxational damping peaks, PO1 and PO2, can be observed. The relaxation strength depends considerably on the oxygen deficiency x. As the value of x increases, the intensity of peak PO1 decreases while that of PO2 increases. The two relaxation processes have activation energies H1=(1.54±0.09) eV and H2=(1.3±0.1) eV, respectively. Models for the relaxation involving the dynamics of oxygen atoms in the Cu-O basal plane and along the twinned interfaces are examined.
Bonetti, E., Campari, E., Mantoani, S. (1992). Off-stoichiometric superconducting phases, oxygen mobility and anelastic relaxation in YBa2Cu3O7−x. PHYSICA. C, SUPERCONDUCTIVITY, 196(1-2), 7-13 [10.1016/0921-4534(92)90130-5].
Off-stoichiometric superconducting phases, oxygen mobility and anelastic relaxation in YBa2Cu3O7−x
Campari, E. G.Secondo
Investigation
;
1992
Abstract
Abstract Elastic energy dissipation measurements were carried out using the vibrating reed and torsional pendulum techniques on polycrystalline YBa2Cu3O7-x specimens in different stoichiometric conditions. In the 300–900 K range two relaxational damping peaks, PO1 and PO2, can be observed. The relaxation strength depends considerably on the oxygen deficiency x. As the value of x increases, the intensity of peak PO1 decreases while that of PO2 increases. The two relaxation processes have activation energies H1=(1.54±0.09) eV and H2=(1.3±0.1) eV, respectively. Models for the relaxation involving the dynamics of oxygen atoms in the Cu-O basal plane and along the twinned interfaces are examined.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
