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Vortex lattice disorder in YBa$_2$Cu$_3$O$_{7-δ$ studied with $\beta$-NMR

TitleVortex lattice disorder in YBa$_2$Cu$_3$O$_{7-δ$ studied with $\beta$-NMR
Publication TypeJournal Article
Year of Publication2009
AuthorsSaadaoui, H, MacFarlane, WA, Morris, GD, Salman, Z, Chow, KH, Fan, I, Hossain, MD, Liang, R, Mansour, AI, Parolin, TJ, Smadella, M, Song, Q, Wang, D, Kiefl, RF
JournalPhysica B: Condensed Matter
Pagination730 - 733
KeywordsVortex state

In this paper, we report Li + 8 β -NMR measurements in thin Ag films deposited on the surface of \{YBa\} 2 Cu 3 O 7 - δ (YBCO) in the vortex state. The resonance in the Ag overlayer broadens dramatically below the superconducting transition temperature T c , as expected from the underlying vortex lattice in the YBCO. However, the lineshape is much broader and more symmetric than expected for an ideal vortex lattice. These results indicate the observed field distribution in the Ag overlayer is dominated by extrinsic, long length scale disorder.