Abstract
The derivative of the low magnetic field nonresonant microwave absorption observed in the granular composites of YBa 2Cu 3O 7− x has been simulated by extending the theory of Xia and Stroud for the electromagnetic response of a single loop of superconducting current in a DC magnetic field (formed by Josephson links) to the case where there is a distribution of loop areas and orientations with respect to the DC magnetic field. Assuming that the distribution of loop areas is determined by a Boltzmann distribution of the energy of the loops in a DC magnetic field, the derivative of the absorption line in the composite is simulated and is in excellent agreement with the absorption observed using an electron paramagnetic resonance spectrometer. The temperature dependence of the absorption intensity at a given field is obtained from the simulation and agrees with measurements. The simulation by itself does not predict the observed broadening and shifts of the line with temperature and magnetic field. These effects are suggested to be a result of the flux trapping properties of the material.
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