MAGNETO TRANSPORT MEASUREMENTS ON SEMI MAGNETIC SEMICONDUCTOR HG1-XFEXTE

Hg//1// minus //xFe//xTe crystals belong to the class of material named 'Semimagnetic semiconductors' because magnetic ions are diluted in an usual semiconductor. For small Fe concentration, Hg//1// minus //xFe//xTe is a small gap or semimetal material. Due to the presence of exchange interaction between the 3d electrons localized at magnetic ions and the mobile conduction or valence electrons, the band structure of such mixed crystals is expected to by strongly modified at high magnetic fields as compared to the band structure of usual small gap semiconductors. Magneto transport measurements on Hg//1// minus //xFe//xTe for x approximately equals 0. 03 in magnetic field up to 17. 5T are performed for the first time on this material. The results are tentatively interpreted by a modified Pidgeon Brown model, taking into account the exchange interaction between the conduction electrons and the 3d localized electrons on the magnetic ions Fe.