Abstract
151Eu Mössbauer spectroscopy has been used to investigate the behaviour of EuAl4 through the four magnetic transitions that occur below 16 K. We find clear evidence for the first transition (TN1, the onset of order) where an incommensurate modulated magnetic structure appears, and the third (TN3) where the modulation disappears at the tetragonal → orthorhombic structural transition. We see no changes at the lowest transition (TN4) but find that the modulation amplitude passes through a maximum at TN2. Data on the isostructural but magnetically simpler EuGa4 are also presented for comparison.
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