Flux-Line Lattice Structures in UntwinnedYBa2Cu3O7−δ
| Autor: | Setsuko Tajima, S. H. Lloyd, Christof M. Aegerter, Alexandre I. Rykov, Stephen Lee, S. T. Johnson, P. G. Kealey, E. M. Forgan, C. Ager, D. McK. Paul, Robert Cubitt |
|---|---|
| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 82:2792-2795 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | A small angle neutron scattering study of the flux-line lattice in a large untwinned single crystal of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ is presented. In fields parallel to the $c$ axis, diffraction spots are observed corresponding to four orientations of a hexagonal lattice, distorted by the $a\ensuremath{-}b$ anisotropy. A value for the anisotropy, the penetration depth ratio, of ${\ensuremath{\lambda}}_{a}/{\ensuremath{\lambda}}_{b}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.18\left(2\right)$ was obtained. The high quality of the data is such that second-order diffraction is observed, indicating a well ordered FLL. With the field at 33\ifmmode^\circ\else\textdegree\fi{} to $c$, a field dependent reorientation of the lattice is observed around 3 T. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|