Direct observation of the flux line lattice in Al-doped YBa2Cu3O7−δ

IV Grigorieva, PA Midgley, KE Bagnall, K Sasaki, JW Steeds

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)


The high-resolution Bitter pattern technique has been used to study the flux line lattice (FLL) in Al-doped YBa2Cu3O7−δ (YBCO) single crystals with 4% of Cu atoms substituted for Al. In contrast to undoped YBCO, the FLL was isotropic and no effects of vortex interaction with twin boundaries were found which is consistent with the extremely small size of the twin domains ≈30 Å in these crystals brought about by Al-doping. In addition, the FLL consisted of misoriented domains inside which an undisturbed regular vortex arrangement was seen, whose dimensions rapidly increased with the magnetic field. This behaviour testifies to the FLL being collectively pinned by weak pinning sites such as vacancies, small defect clusters, etc. Proceeding from the dimensions of these domains, we estimated the critical current density for our crystals to be jc≈3x102 A/cm2, two orders of magnitude lower than the typical value for undoped YBCO single crystals, but of the same order of magnitude as for Fe-doped YBCO.
Translated title of the contributionDirect Observation of the Flux Line Lattice in Al-doped YBa2Cu307-
Original languageEnglish
Pages (from-to)73-83
Number of pages11
JournalPhysica C: Superconductivity and its Applications
Issue number1-2
Publication statusPublished - 15 Aug 1992

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50th Anniversary Meeting of EMSA

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