Abstract
The antiferromagnetic ordering in orthorhombic (Pnma) CeGe 1− x Si x pseudobinary series was studied by powder neutron diffraction and μSR measurements. The ordering temperature varies linearly between 10.4 K for CeGe and 6.1 K for CeSi. The magnetic phase diagram comprises two distinct regions of magnetic ordering as a function of Si concentration x, which are characterized by the wave vectors q 1=(0, 1 2 ,0) r.l.u. , for 0⩽ x⩽0.8 and q 2=(0, 1 2 , 1 16 ) r.l.u. for CeSi. Both structures correspond to collinear arrangements of the Ce moments within the ( a, b) plane. The ordered Ce 3+ moment value of 1.0(1)μ B/atom at 1.5 K of the commensurate q 1 phases as well as the amplitude of the wave of the modulated q 2 phase (1.56(4)μ B/atom) are strongly reduced compared to the free Ce 3+ ion value gJμ B=2.14μ B. A narrow field distribution observed with μSR suggests that CeSi has a commensurate square wave magnetic structure, which possibility could not be tested in the neutron work due the unobservability of the expected weak higher harmonics. The temperature dependence of the internal field detected by μSR suggests that the spin interactions are long range in CeSi, but short ranged in CeGe. These results point towards a localized non-Kondo behavior for CeSi and strong hybridization of the 4f electrons with the conduction band for CeGe.
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