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Abstract:
The lightly hole-doped system CeOs1.94Re0.06Al10 has been studied by
muon spin relaxation and neutron diffraction measurements. A long-range
antiferromagnetic ordering of the Ce sublattice with a substantially
reduced value of the magnetic moment 0.18(1)mu(B) has been found below
T-N = 21 K. Similar to the undoped parent compound, the magnetic ground
state of CeOs1.94Re0.06Al10 preserves the anomalous direction of the
ordered moments along the c axis. The obtained result reveals the
crucial difference between electron-and hole-doping effects on the
magnetic ordering in CeOs2Al10. The former suppresses the anisotropic
c-f hybridization and promotes localized Ce moments controlled by single
ion anisotropy. On the contrary, the latter increases the hybridization,
keeping the dominant role of the anisotropic exchange on the direction
of the moments and shifts the system towards a delocalized nonmagnetic
state.
