The temperature and pressure dependence of the 3d5transitions in Zn1-xMnxS

The absorption spectra of Zn 1-x Mn x S with x=0.06, 0.20 and 0.40 were investigated. Five absorption bands were observed which are attributed to the transitions 6 A 1 to 4 T 1 , 4 T 2 , 4 A 1 + 4 E, 4 T 2 , 4 E. The temperature and pressure dependence of the bands were recorded. The room temperature pressure shifts are consistently explained by a change of the Racah parameter dB/dP and crystal-field splitting d(10Dq)/dP with pressure. It was found that adB/da is a constant in the whole series of Zn 1-x Mn x Te, Zn 1-x Mn x Se and Zn 1-x Mn x S with a value of about 95 meV.