Mesoscopic inhomogeneity, 55Mn NMR, CMR and magneto-transport properties of La0.6Sr0.2Mn(1.2-x)Fe(x)O3 manganites

Valentin P. Pashchenko 1Aleksandr A. Shemiakov 1Aleksey V. Pashchenko 1Vasilij K. Prokopenko 1Viacheslav N. Derkachenko 1Vladimir P. Dyakonov 1,2Henryk Szymczak 2

1. National Academy of Sciences of Ukraine, Donetsk Technical-Physical Institute, R. Luxemburg 72, Donetsk 83114, Ukraine
2. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland

Abstract

Complex studies of La0.6Sr0.2Mn(1.2-x)Fe(x)O3 (x = 0; 0.02; 0.05; 0.1) manganites have been performed. Interrelation between the Fe ions concentration and CMR, magneto-transport and 55Mn NMR properties is established. It is shown that the magnetoresistance is increased, temperatures of magnetic and metal-insulator transitions as well as resonance frequency of 55Mn NMR is decreased and 55Mn NMR spectrum is expanded towards lower frequencies with increasing Fe content. These particularities are shown to be due to the weakening in change interactions between Mn ions as a result of both Fe doping and occurrence of defects of vacancy and cluster types.

 

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium D, by Valentin P. Pashchenko
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-27 10:23
Revised:   2009-06-08 12:55