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

 Title Vortex lattice disorder in YBa$_2$Cu$_3$O$_{7-δ$ studied with $\beta$-NMR Publication Type Journal Article Year of Publication 2009 Authors Saadaoui, 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 Journal Physica B: Condensed Matter Volume 404 Pagination 730 - 733 ISSN 0921-4526 Keywords Vortex state Abstract 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. URL http://www.sciencedirect.com/science/article/pii/S0921452608006558 DOI 10.1016/j.physb.2008.11.229