Kondo-like electronic transport and ferromagnetic cluster-glass behavior in La_0.7Sr_0.3MnO₃nanostructures

Abstract

We have studied electronic transport and magnetic properties of nanocrystalline La0.7Sr0.3MnO3 system. The samples were prepared by sol-gel method and were sintered at different temperatures to achieve few nanometre grain sizes.The temperature dependent resistivity revealed Kondo like electronic transport at low temperature (T <50 K) and variable range hopping in the paramagnetic insulating regime under zero and high magnetic field. The reduced grain size sample showed marginal increase in electrical resistivity. The temperature-field dependent ac-susceptibility measurement indicated the FM-cluster formation. A neck like magnetic hysteresis loop was observed due to the competition between ferromagnetic core and paramagnetic shell. The ferromagnetic clusters with paramagnetic interfaces impart glassy behavior.

Perovskite Solar Cells: The Challenging Issues for Stable Power Conversion Efficiency

“…Transition metal halide and oxide perovskite structures were studied extensively over the decades particularly of their electronic and magnetic transport, magnetic properties, phase transitions and particularly of their high abundance [35][36][37][38][39]. As for as the transition metal oxides/halide perovskites are concerned with regard to their optoelectronic applications, various alternatives of lead-free transition metal perovskites have been predicted to be promising replacement candidates, however, the problems associated to their chemical stability, ionic radii hinders their functionality for photovoltaics.…”