Effects of magnetic history on the ac magnetic susceptibility of granular YBa2Cu3O7−δ superconductors in weak fields
Sang Young Lee, Min Ah Suh, Sang Min Bae, Sang Sam Choi, In-Sang Yang
DOI 10.1103/PhysRevB.51.16302 · Physical Review B
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Abstract
We investigate the ac susceptibility of both field-cooled and zero-field-cooled sintered YBa2Cu3O7−δ granular thin slabs and powders in low magnetic fields. The ac susceptibility of the granular thin slabs appears to depend upon the magnetic history for dc fields larger than a certain value, Hdc*, with the existence of the stronger diamagnetic signal (the in-phase part of the ac susceptibility) in the field-cooled case. Our results show that the difference in local flux distributions between the field-cooled case and the zero-field-cooled case exists even for a dc field as low as several Oe, a value much lower than the bulk lower critical field (Hc1). The upper limit of a homogeneous superconducting area determined from Hdc* appears comparable to the average grain size in our granular thin slabs. The existence of Hdc* is attributed to the superconducting glass behavior of granular YBa2Cu3O7−δ with disorder in the intergranular Josephson junctions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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