A. V. Pashchenko, V. P. Pashchenko, Yu. F. Revenko, V. Z. Spuskanyuk, N. G. Kasatka, V. A. Turchenko, A. A. Shemyakov, “Effect of high pressure and torsional strain on the structure, microstresses, $^{55}$Mn NMR, and magnetoresistance of La$_{0.6}$Sr$_{0.3}$Mn$_{1.1}$O$_{3\pm\delta}$ nanopowders”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2010, Volume 36, Issue 12,Pages 55

This article is cited in 4 papers

Effect of high pressure and torsional strain on the structure, microstresses, $^{55}$Mn NMR, and magnetoresistance of La$_{0.6}$Sr$_{0.3}$Mn$_{1.1}$O$_{3\pm\delta}$ nanopowders

A. V. Pashchenko, V. P. Pashchenko, Yu. F. Revenko, V. Z. Spuskanyuk, N. G. Kasatka, V. A. Turchenko, A. A. Shemyakov

Galkin Donetsk Institute for Physics and Engineering, Donetsk

Abstract: The effects of high pressure (3 GPa) and torsional strain on the structure and properties of compacts prepared from nonstoichometric lanthanum-strontium manganite La$_{0.6}$Sr$_{0.3}$Mn$_{1.1}$O$_{3\pm\delta}$ (LSMO) nanopowder with a perovskite structure have been studied for the first time using X-ray diffraction, low-temperature Ar adsorption, electron microscopy, and magnetic ($\chi_{ac}$, ЯМР $^{55}$Mn NMR, and magnetoresistance) measurements. The laws governing the influence of this treatment on the structure, local valence and magnetic states of manganese ions and their inhomogeneous environment (involving other ions and defects), and on the resistivity, microstresses, coercivity, Curie temperature, and magnetoresistance of LSMO nanopowder compacts have been determined. A positive effect of several cycles of torsion under pressure on the magnetoresistance of this material has been observed for the first time.

Received: 27.11.2009
Accepted: 11.02.2010