AC susceptibility harmonic response in YBCO single crystals with different oxygen contents
We measured up to the seventh harmonic response of the complex ac susceptibility (χ′ n - jχ″ n ; n = 1-7) vs. temperature, in YB 2 C 3 O x single crystals with different oxygen contents (6.5 ≤ x ≤ 7). The ac field was applied in presence of an external dc field both parallel to the c-axis of the cry...
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| Autores principales: | , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09214534_v377_n4_p466_Moreno |
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| Sumario: | We measured up to the seventh harmonic response of the complex ac susceptibility (χ′ n - jχ″ n ; n = 1-7) vs. temperature, in YB 2 C 3 O x single crystals with different oxygen contents (6.5 ≤ x ≤ 7). The ac field was applied in presence of an external dc field both parallel to the c-axis of the crystals. We show evidence that deoxygenation leads to a reduction of bulk pinning strength evidenced by a decrease in the value of the third, fifth and seventh harmonics. We compare our measurements with a numerical model that includes effects of flux creep and sample geometry where the activation barrier depends explicitly on temperature. © 2002 Elsevier Science B.V. All rights reserved. |
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