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We report on novel magnetic and electronic properties of SrCo6O11 thatexhibits a unique stepwise magnetization and its relevant magnetotransportphenomena investigated by the site-selective 59Co nuclear magnetic resonance(NMR) at zero and applied magnetic fields. This compound is composed of threeCo sites in the unit cell, i.e., Co(1) in the metallic Kagome layer, a Co(2)dimerized pillar between the layers and Co(3) in the triangular lattice.Zero-field NMR spectra have revealed that large local moments at the Co(3)sites are magnetically ordered without any trace of bulk magnetization M atzero field. The field-swept NMR spectra show that the internal hyperfine fieldat the Co(1) site is derived from fully polarized moments Ms at the Co(3) sitesin the "1"-plateau state at fields higher than 2.5 T, whereas it is partiallycancelled out in the "1/3"-plateau state in which one-third of Ms is induced atintermediate fields once a small field is applied. It has been clarified from amicroscopic point of view that the local moments at Co(3) site undergo afield-induced ferrimagnetic (up-up-down)-to-ferromagnetic (up-up-up)transition, which is consistent with the evidence obtained from the recentneutron diffraction experiment. The Co(1) Kagome layer and the dimerized pillarCo(2) site between the layers are of nonmagnetic origin, suggesting that thenearly quasi-2D metallic conductivity is dominated by nonmagnetic Co(1) andCo(2) sites. Consequently, unique magneto-transport phenomena observed inSrCo6O11 are demonstrated owing to the interaction between the conductionelectrons at the Co(1) and Co(2) sites and the local moments at Co(3) sites.Comment: 6 pages, 6 figures. To be published in J.Phys.Soc.Jpn, Vol.75, No.9  (2006

journal of the physical society of japan

59Co-NMR Probe for Stepwise Magnetization and Magnetotransport in SrCo6O11 with Metallic Kagomé Layer and Triangular Lattice with Local Moments