ABSORPTION SPECTRUM OF AN ANTIFERROMAGNETIC RARE-EARTH GARNET DY3AL5O12 ABOVE AND BELOW NEEL TEMPERATURE

The absorption spectrum of a Dy3+ ion in dysprosium aluminum garnet in the paramagnetic state has been investigated in the region of 15,000 to 5,000 cm -1. By observing the Zeeman effect in both pulsed and stationary magnetic fields, the gz-values of the lowest three levels of the 6H15/2 ground state split by crystalline-field and of the three levels of the 6H5/2 excited state split by crystalline-field have been determined. From the splittings of the absorption lines corresponding to the 6H15/2 ⟶ 6F5/2 transition in the antiferromagnetic state, the internal fields acting on the Dy3+ ions in the ground and the 6F5/2 excited states have been estimated to be 6.2 and 6.8 kOe, respectively. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.