IV-VI Semimagnetic Semiconductors with Rare Earth Ions

Abstract

The electronic and magnetic properties as well as the applications of IV-VI semiconductors with rare earth ions of Eu and Yb are briefly discussed. The detailed analysis is presented of the recent experimental investigations of the magnetic and transport properties of IV-VI semimagnetic crystals with Gd. It concerns, in particular, the effect of Fermi level position controlled f-f exchange interaction between Gd ions in Sn1-xGdxΤe.

Effect of gallium doping on the electronic structure of lead‐telluride‐based alloys

“…The first is located within the gap, 70 meV below the bottom of the conduction band, while the second is resonant with the conduction band lying 45 meV above its minimum. Similar behaviour where two different defect levels are associated with an impurity of mixed valence has been observed earlier in Pb 1-y Sn y Te alloys doped with gadolinium [19,20]. One can suppose that two gallium-induced levels revealed in this study are also connected with two different types of defects.…”

IV-VI Semimagnetic Semiconductors: Recent Developments

“…Apart from the Eu-based IV-VI semimagnetic semiconductors the crystals with Gd such as Sn 1 -x Gd x Te [4,12] and Pb1-x -y Sny Gd x Te [13] are also investigated. The research in this field was recently reviewed in Ref.…”

“…The research in this field was recently reviewed in Ref. [4]. The IV-VI materials with other rare-earth ions are now available for research.…”

“…They show, in particular, semimetallic electric properties and allow for a simple control of carrier concentration by means f doping or isothermal annealing. As opposed to II-VI semimagnetic materials, IV-VI crystals are known to form solid solutions not only with magnetic ions from 3d group (like Mn), but also with the elements f 4f group (Eu, Gd, Ce, Yb) [3][4][5] and the elements f 5 f group (U) [6].…”

Electrical and thermoelectric properties of PbSe doped with Sm

“…They have been used as sensors for infrared radiation, photoresistor, lasers, solar cells, optoelectronic devices and thermoelectric devices [1][2][3][4][5][6][7][8][9]. Thermoelectric devices have been used practically in wider areas recently, such as in consumer products like small refrigerators and in high-tech applications like in cooling units for fiber junctions in optical fiber communication technology [10,11]. They are reliable energy converters and have no noise or vibration, as there are no mechanical moving parts [12,13].…”