Author/Authors :
Romanova، نويسنده , , O.B. and Ryabinkina، نويسنده , , L.I. and Sokolov، نويسنده , , V.V. and Pichugin، نويسنده , , A.Yu. and Velikanov، نويسنده , , D.A. and Balaev، نويسنده , , D.A. and Galyas، نويسنده , , A.I. and Demidenko، نويسنده , , O.F. and Makovetskii، نويسنده , , G.I. and Yanushkevich، نويسنده , , K.I.، نويسنده ,
Abstract :
The structural, magnetic, electrical, and thermoelectric properties of GdXMn1−XS ( 0.01 ≤ X ≤ 0.3 ) solid solutions synthesized for the first time on the basis of α -MnS have been studied experimentally in the temperature range 77–1000 K in magnetic fields up to 10 kOe. The synthesized samples are antiferromagnetic semiconductors with an NaCl-type cubic lattice typical of α -MnS. Both concentration ( X c = 0.3 ) and temperature ( T c = 450 K ) metal–insulator phase transitions have been observed. The concentration metal–insulator transition is accompanied by a decrease in resistivity and thermopower by twelve and two orders of magnitude, respectively, with the change in conductivity from p-type to n-type.
Keywords :
A. Insulator , B. Crystal growth , D. Phase transitions , A. Metals
