P-31-N M R, Ru-101-Nqr, Mu Sr Study Of Filled Skutterudite Tbru4p12

Filled skutterudite TbRu4P12 exhibits antiferromagnetic ordering below 20 K. Additional magnetic ordering below 10 K exists under zero field and the origin of this successive magnetic ordering might be related to multipole ordering. In order to reveal the detailed properties of the magnetic transition in TbRu4P12, we performed zero-field P-31 nuclear magnetic resonance(NMR), Ru-101 nuclear quadrupole resonance(NQR), muon spin rotation(mu SR). The zero-field P-31-NMR spectra indicate the magnetic transition only at 20 K, while the time spectra of mu SR of TbRu4P12 indicate the additional increase of the internal field below 10 K. Moreover, we observed an anomalous temperature dependence of the spin-lattice relaxation rate T-1(-1) just below 20 K and small anomaly at around 10 K in Ru-101-NQR.