Abstract

Multiharmonic analysis of the magnetic AC susceptibility of a YBa 2Cu 3O 7−δ powder sintered sample has been performed, measuring nine in-phase, χ n ′ ( T), and out-of-phase, χ n ″ ( T), components. Measurements at zero and low bias DC field, H o, have been performed. For even n, both χ n ′ ( T) and χ″ n ( T) are very sensetive to H o and become zero at real zero field. Odd harmonics ( n≥3) strongly depend on H o and on the weak-link nature. Furthermore, from χ n ′ and χ n ″ ( T) AC hysteresis loops have been derived and analyzed. The applicability of available theoretical models in the description of the harmonic components has been analyzed.

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