Mossbauer spectra from (NH₄)₂FeCl₅.H₂O in applied magnetic fields

Abstract

M k b a u e r absorplion spectra have been recorded for singlecrystal samples of the antiferromagnetic mmpound (NHs)2FeCIr.Hz0 in applied magnetic fields up to 10 ?: A reorientation of the Fe ion spins h m the rrystal (1 axis U) Ihe c axis was obsewed. ?his transition was found U) be a continuous and planar mtation at fields around 2 ?: Detailed fitting of the spectra in he spin-reorientation region indicated some inequality between the magnelic hyperfme fields associated with oppositely directed ionic spins.