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Search for time-reversal symmetry breaking order at the (110) interface of YBa$_2$Cu$_3$O$_{7-δ$ using $\beta$NMR

TitleSearch for time-reversal symmetry breaking order at the (110) interface of YBa$_2$Cu$_3$O$_{7-δ$ using $\beta$NMR
Publication TypeJournal Article
Year of Publication2009
AuthorsSaadaoui, H, Morris, GD, Chow, KH, Hossain, MD, Levy, CDP, Parolin, TJ, Pearson, MR, Salman, Z, Smadella, M, Song, Q, Wang, D, Hentges, PJ, Greene, LH, Kiefl, RF, MacFarlane, WA
JournalPhysica B: Condensed Matter
Volume404
Pagination724 - 726
ISSN0921-4526
KeywordsTime-reversal symmetry breaking
Abstract

In this paper, we report initial β \{NMR\} measurements seeking the spontaneous magnetic fields associated with a time-reversal symmetry breaking (TRSB) order at the (1 1 0) interface of the high temperature superconductor \{YBa\} 2 Cu 3 O 7 - δ (YBCO). A 2 keV beam of highly spin-polarized Li + 8 was implanted into a thin overlayer of silver sputtered onto an oriented \{YBCO\} film. The \{NMR\} of Li 8 in the Ag layer showed additional broadening with an onset below the superconducting transition temperature T c . This is evidence of spontaneous disordered magnetism which could be associated with \{TRSB\} order.

URLhttp://www.sciencedirect.com/science/article/pii/S0921452608006534
DOI10.1016/j.physb.2008.11.188