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We have carried out neutron diffraction, muon spin relaxation (muSR) andinelastic neutron scattering investigations on a polycrystalline sample ofCeOs2Al10 to investigate the nature of the phase transition observed near 29 Kin the resistivity and heat capacity. Our muSR data clearly reveal coherentfrequency oscillations below 28 K, indicating the presence of an internal fieldat the muon site, which confirms the long-range magnetic ordering of theCe-moment below 28 K. Upon cooling the sample below 15 K, unusual behaviour ofthe temperature dependent muSR frequencies may indicate either a change of themuon site, consistent with the observation of superstructure reflections inelectron diffraction or a change of the ordered magnetic structure. Neutrondiffraction data do not reveal any clear sign of either magnetic Bragg peaks orsuperlattice reflections. Furthermore, inelastic neutron scattering (INS)measurements clearly reveal the presence of a sharp inelastic excitation near11 meV between 5 K and 26 K, due to opening of a gap in the spin excitationspectrum, which transforms into a broad response at and above 30 K. Themagnitude of the spin-gap (11 meV) as derived from the INS peak position agreesvery well with the gap value as estimated from the bulk properties.

Direct evidence of long-range ordering of reduced magnetic moments in the spin-gap compound CeOs2Al10 through muon spin relaxation investigations