Abstract
We report on the spin-glass behavior of . Irreversible and time-dependent effects in the intensities of magnetic Bragg scattering derived from neutron diffraction reveal this behavior pronouncedly below K. Further evidence comes from the dc isothermal and thermoremanent magnetization. The Mössbauer spectra show a sudden onset of magnetic hyperfine splitting below and a flat temperature dependence together with irreversible effects under applied magnetic fields. A transition temperature from aligned to random spin-glass states , is reported. 70 K, depending on the applied magnetic field. Most unusual is the lack (or extremely broad) of a cusp in the ac susceptibility in the vicinity of .
- Received 9 March 1989
DOI:https://doi.org/10.1103/PhysRevB.40.745
©1989 American Physical Society