Analysis on insulator–metal transition in yttrium doped LSMO from electron density distribution

Abstract

Yttrium doped LSMO (La 1−x Sr x MnO 3) was prepared using sol-gel technique and analysed for the insulator-metal transition from charge density variation in the unit cell with respect to different stoichiometric inclusion of yttrium. X-ray powder diffraction profiles of the samples were obtained and the well known Rietveld method and a versatile tool called maximum entropy method (MEM) were used for structural and profile refinement. The charge density in the unit cell was constructed using refined structure factors and was analysed. The charge ordering taking place in the insulator-metal transition was investigated and quantified. The insulator-metal transition was found to occur when 20% of La/Sr atoms were replaced by yttrium. The changes in the charge environment have also been analysed.

Structural, magnetic and optical characterization of Ni0.8Zn0.2Fe2O4 nano particles prepared by co-precipitation method

“…The unique feature of this charge density is that it is real and positive. This charge density gives an accurate picture of the distribution of charges in the unit cell, which is then analyzed for bond related properties [30].…”

Role of Fe (x = 0–0.15) Substitution on Structural, Magnetic, and Transport Properties of the La0.7Sr0.3FexMn1−xO3 System

“…There are different reports available on the study of the substitution of La 3+ (A-site) with other rare-earth ions (Y, Sm, Ce, Bi, Gd, and Nd etc.) in addition to the Sr on the magnetic and transport parameters of LSMO [12][13][14][15][16][17] . Doping at the A-site directly affects the Mn-O-Mn bond angle which modifies the magnetic and transport properties.…”

“…in addition to the Sr on the magnetic and transport parameters of LSMO. [12][13][14][15][16][17] Doping at the A-site directly affects the Mn-O-Mn bond angle which modifies the magnetic and transport properties. The doping at the A-site results in improvement in magnetocaloric effect, temperature coefficient of resistance (TCR), and magnetoresistance of the LSMO.…”