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Charge conduction; MR behaviour; nanostructured; manganites.

In this communication, structure and charge, conduction mechanisms have been understood for sol–gel grown nanostructured La$_{0.6}$Nd$_{0.1}$Sr$_{0.3}$MnO$_3$ (LNSMO) manganites prepared at different process temperatures under air and oxygen environments. Obtained X-ray diffraction patterns of all the samples were analysed using Rietveld refinements and obtained structural lattice parameters have been discussed in correlation with resistivity behaviour of the samples. Observed low temperature resistivity upturn behaviour has been examined in the context of electron–electron scattering mechanism. Metallic and insulating/semiconducting behaviours of all the nanostructured LNSMO manganites have been understood by using various models and mechanisms. Magnetoresistance isotherms have also been theoretically fitted and separate grain and grain boundary contributions have been studied for LNSMO manganite samples. Allobtained fitting parameters have been discussed in the context of role of applied magnetic field, process temperature and annealing environment.

HETAL BORICHA¹ S B KANSARA¹ BHARGAV RAJYAGURU¹ SAPANA SOLANKI¹ K N RATHOD¹ DAVIT DHRUV¹ P S SOLANKI¹ N A SHAH¹

1. Department of Physics, Saurashtra University, Rajkot 360 005, India

Published

2 September 2020

Manuscript received

13 January 2020

Accepted

5 June 2020

Final version published online

2 September 2020