Electron spin resonance measurements on a single-crystalline and a powder GdAs have been performed in the temperature range from 4.2 to 40 K and in the frequency range from 55 to 585 GHz to obtain microscopic information about the magnetic structure. The results obtained indicate that GdAs is an `easy-plane' antiferromagnet with the magnetic moment lying in the (1 1 1) plane below Neel temperature (approximately 19 K). According to an analysis of mean-field approximation, the exchange field and the out-of-plane anisotropy field have been estimated to be μ0HE = 8.1 T and μ0HA = 1.4 T, respectively. The transition field (Hc = 2HE+HA) from the antiferromagnetic to the forced ferromagnetic state is deduced to be 17.6 T which is in good agreement with the result of high-field magnetization measurement by Li et al.
|Number of pages||2|
|Journal||Physica B: Condensed Matter|
|Publication status||Published - 2000 Jun 1|
|Event||Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn|
Duration: 1999 Aug 24 → 1999 Aug 28