NUCLEAR MAGNETIC RESONANCE OF 55Mn AND 75As IN MnAs.

Article abstract of DOI:10.1016/0304-8853(82)90005-1

Four sets of NMR signals, two each, from **5**5Mn and **7**5As nuclei have been observed. The temperature dependences of **5**5Mn resonances have been studied from 77 to 311 K and that of **7**5As, from 77 K to about 250 K. The results show that there is a phase transition at T//1 approximately equals 220 K. This transition may be due to introduction of a local spontaneous distortion in the region of the domain walls in the lattice, resulting in lowering of symmetry at low temperatures. Another possibility is the canting of spins which would lower the magnetic group symmetry.