Mössbauer Studies of Fe2As

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Abstract
Mössbauer spectra of the antiferromagnetic compound Fe2As have been recorded at various temperatures and the eigenvalues for the nuclear excited state are derived from the least square fitted Mössbauer spectra. The nuclear Hamiltonian matrix has been solved for different ratios of the magnetic and axially-symmetric quadrupole interaction (for both positive and negative efg values) and with varying relative orientation between them. By comparing the experimental eigenvalues with those obtained by solving the above matrix, it is shown that the quadrupole interaction does not show any discontinuity near the magnetic transition temperature and the sign of efg is negative. Further at temperatures close toTN, the spins almost lie in the C-plane. As the temperature is lowered, the spins gradually rotate from the basal plane and make an angle of ∼ 16° at liquid nitrogen temperature. These observations are different from the previously reported Mössbauer results. The observed values of the chemical isomeric shift and the hyperfine field at the two sites have been discussed in relation to their known magnetic moment values.

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