Connection of thermopower, magnetothermopower with resistivity and magnetoresistance in manganites with Nd and Sm

Luidmila Koroleva; Ivan Batashev; Artem Morozov; Anatolii Balbashov; Henryk Szymczak; Anna Slavska-Wanniewska

doi:10.1051/epjconf/201818506014

Proceedings

Open Access

EPJ Web of Conferences 185, 06014 (2018)
https://doi.org/10.1051/epjconf/201818506014

Connection of thermopower, magnetothermopower with resistivity and magnetoresistance in manganites with Nd and Sm

Luidmila Koroleva¹^*, Ivan Batashev¹, Artem Morozov¹, Anatolii Balbashov², Henryk Szymczak³ and Anna Slavska-Wanniewska³

¹ Moscow State University, 19991 Moscow, Russia
² Moscow Power Engineering Institute, 19991 Moscow, Russia
³ Institute of Physics Polish Academy of Sciences, Warsaw, Poland

^* Corresponding author : koroleva@phys.msu.ru

Published online: 4 July 2018

Abstract

Thermopower, magnetothermopower resistivity and magnetoresistance of single crystal samples Re(_1-x)Sr_xMnO₃ (0 ≤ x ≤ 0.3, Re = Nd, Sm) were studied in wide temperature interval, included the Curie temperature T_C. Giant maxima of resistivity and thermopower, very big negative magnetothermopower and magnetoresistance were found in TC region. So, a giant maximum of thermopower in T_C was found, which suppressed by magnetic field. Simultaneous magnetic field destroys magneto-impurity states – ferrons as evidenced the maxima resistivity and magnetoresistance in T_C Hence it follows that giant thermopower in manganites are produced by ferrons and its value is set by the quantity of impurities, that is the concentration of impurities and the volume of sample.

© The Authors, published by EDP Sciences, 2018

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