MOSSBAUER EFFECT OF FE57 IN CRO2

Samples of CrO2 containing a small quantity of Fe57 were prepared and the Mossbauer effect was measured at various temperatures. It was found that Fe atoms were dissolved in CrO2 taking the electronic state of trivalent ion. The temperature dependence of the internal magnetic field at Fe was analyzed with using a simple molecular field approximation and the coupling between Fe and Cr was discussed. The spin direction of Fe was determined to be antiparallel to the magnetization of CrO2 matrix by the Mossbauer measurement in an external magnetic field (45 kOe). © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.