Multiple- $q$ Magnetic Structure in Ce ${Al}_{2}$

New neutron-diffraction measurements on single crystals of Ce

{Al}_{2}

confirm the previously reported incommensurate antiferromagnetic ground state with peaks at

{\vec{q}}_{I} = (\frac{1}{2} \pm α, \frac{1}{2} \mp α, \frac{1}{2})

. In addition, weaker superlattice peaks are observed at

{\vec{q}}_{c} = (\frac{1}{2}, \frac{1}{2}, \frac{1}{2})

and their position and temperature dependence can be explanined in terms of a multiple-

q

structure in Ce

{Al}_{2}

. This appears to be the first definitive evidence for a multiple-

q

magnetic structure.

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Multiple-qMagnetic Structure in CeAl2