B-11 NMR in the layered diborides OsB2 and RuB2

TitleB-11 NMR in the layered diborides OsB2 and RuB2
Publication TypeJournal Article
Year of Publication2007
AuthorsSuh BJ, Zong X, Singh Y, Niazi A, Johnston DC
Journal TitlePhysical Review B
Volume76
Pages144511
Date PublishedOct
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000250620300094
KeywordsBORON, SUPERCONDUCTING MGB2
Abstract

B-11 nuclear magnetic resonance (NMR) measurements have been performed on B-11 enriched OsB2 and RuB2 polycrystalline powder samples in an external field of 4.7 T and in the temperature range, 4.2 K < T < 300 K. The spectra for both samples show similar quadrupole powder patterns that are typical for a nonaxial symmetry. The Knight shifts K in both samples are very small and constant in temperature. The nuclear spin-lattice relaxation rate T-1(-1) follows a Korringa law in the whole temperature range investigated with T1T=600 and 680 sK for OsB2 and RuB2, respectively. The experimental results indicate that a p character dominates the conduction electron wave function at the B site with a negligibly small s character in both compounds.

DOI10.1103/PhysRevB.76.144511
Alternate JournalPhys. Rev. B