Conventional magnetometry yields a low temperature bulk magnetic moment of about 4μB/Dy3+ in an applied field of μ0H =9 T for thin and thick dysprosium nitride (DyN) films. This is significantly lower than the maximum possible value of 10 μB/Dy3+. Ion-assisted deposition was used to grow 5.7-μm-thick rare earth nitride DyN films on organic Kapton® substrates. 161Dy Mössbauer spectroscopy (with its time scale on the order of nanoseconds) indicates thermal relaxation between fully stretched ±10μB levels of a low-lying Kramers doublet, which is inconsistent with the Dy3+ site's ideal cubic symmetry. However, a small tetragonal distortion [ϵ ≈ -0.024(10)] observed using x-ray powder diffraction is compatible with an additional rank 2 crystal field term, B02 ≈ -1.0(4)K, approaching the magnitude estimated to bring this about. The observed magnetic behavior can then be described using a two-level, molecular field model with θC set to ≈6-8K, which is substantially smaller than the accepted ordering temperature of TC≈17-26K.
|Number of pages||9|
|Journal||Physical Review B: Condensed Matter and Materials Physics|
|Publication status||Published - 2017|