Physics of the Solid State
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Turning of activation energy and magnetoimpedance by alternating current frequency in manganese sulfide with partial substitution by samarium ions
Aplesnin S S
1, A.M. Kharkov
1, Sitnikov M.N
1
1Siberian State University of Science and Technology, Krasnoyarsk, Russia
Email: apl@iph.krasn.ru
The dynamic characteristics of the SmxMn1-xS solid solution are studied by impedance spectroscopy in the frequency range of 102-106 HZ, IR spectroscopy in the temperature range of 80-500 K. The relaxation time of current carriers and its dependence on temperature from the impedance hodograph are found. A correlation between the temperatures of anomalies in the transport characteristics and the frequency of softening of the IR vibration mode of the octahedron is established. The frequency dependence of the activation energy and the critical frequency of the transition from semiconductor to metallic type of conduction are found. The reversal of the sign of the magnetoimpedance and magnetoresistance on alternating current in SmxMn1-xS upon heating and their maximum in the region of the electronic structural transition are determined. The magnetoimpedance in the paraphase is explained by the change in the permittivity in a magnetic field. Keywords: semiconductors, impedance, magnetoimpedance.
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