Connection of Thermopower, Magneto Thermopower with Resistivity and Magnetoresistivity in Nd(1-x)SrxMnO3 and Sm(1-x)SrxMnO3 Manganites
American Journal of Physics and Applications
Volume 5, Issue 6, November 2017, Pages: 84-90
Received: Aug. 27, 2017;
Accepted: Sep. 15, 2017;
Published: Oct. 13, 2017
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Liudmila Koroleva, Physics Faculty, Lomonosov Moscow State University, Moscow, Russia
Ivan Batashev, Physics Faculty, Lomonosov Moscow State University, Moscow, Russia
Artem Morozov, Physics Faculty, Lomonosov Moscow State University, Moscow, Russia
Anatol Balbashov, Scientific Research Center “Management Problem Energy Resource” of Moscow Power Engineering Institute, Moscow, Russia
Henryk Szymczak, Institute of Physics Polish, Academy of Sciences, Warsaw, Poland
Anna Slawska-Waniewska, Institute of Physics Polish, Academy of Sciences, Warsaw, Poland
Sabina Lewinska, Institute of Physics Polish, Academy of Sciences, Warsaw, Poland
An experimental study of thermopower, magneto thermopower, magnetoresistivity and magnetization of Nd(1-x)SrxMnO3 and Sm(1-x)SrxMnO3 with 0 ≤ х ≤ 0.3 was conducted. A steep rise of thermopower as well as giant values of magneto thermopower and magnetoresistivity were observed near Curie temperature ТС in compounds with 0.15 ≤ х ≤ 0.3. On the other hand, no special features were found in case of х = 0. It has been known that compounds with 0.1 ≤ х ≤ 0.3 consist of ferromagnetic clusters of ferron (magnetic polaron) type located in A-type antiferromagnetic matrix. An increase of thermopower near ТС is caused by ferrons as with the application of magnetic field or temperatures higher than ТС thermopower falls sharply due to the destruction of ferrons. So, the value of thermopower is directly connected to the number of magnetic polarons in sample. Therefore, thermopower in doped magnetic semiconductors is determined by level of doping and volume of the sample.
Connection of Thermopower, Magneto Thermopower with Resistivity and Magnetoresistivity in Nd(1-x)SrxMnO3 and Sm(1-x)SrxMnO3 Manganites, American Journal of Physics and Applications.
Vol. 5, No. 6,
2017, pp. 84-90.
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