A-site disorder driven sharp field-induced transition and collapse of charge ordering in Sm1/2Ca1/2-xSrxMnO3

Abstract

Effect of fast neutron irradiation induced defects on the metamagnetic transition In Ce(Fe0.96Ru0.04)2 J. Appl. Phys. 112, 063922 (2012) Cross-plane electronic and thermal transport properties of p-type La0.67Sr0.33MnO3/LaMnO3 perovskite oxide metal/semiconductor superlattices J. Appl. Phys. 112, 063714 (2012) Experimental evidences of the conservation of the S=1 moment in La2RuO5 determined by perturbed angular correlations J. Appl. Phys. 112, 063915 (2012) Effect of thermal cycle on the interfacial antiferromagnetic spin configuration and exchange bias in Ni-Mn-Sb alloy AIP Advances 2, 032181 (2012) Study of ferromagnetic transition in Pd nanometer-scale constrictions using a mechanically controllable break junction techniqueOur study on Sm 1=2 Ca 1=2Àx Sr x MnO 3 (x ¼ 0, 1/6, 1/3, and 1/2) system shows an unusual consequence in magnetic field-induced transition to ferromagnetic metallic state and collapse of charge ordering in the intermediate compositions. Interestingly, the transition is sharp or step-like at low temperature that is observed at much lower field ($75 kOe) for intermediate compositions than the end compositions (not visible up to 100 kOe). The atomic-scale local inhomogeneity/ distortion arising from ionic mismatch due to doping is supposed to be critical behind this field-induced transition. The charge ordering temperature observed from magnetization and magnetoresistance studies decreases with increasing x which is consistent with the results for R 1=2 A 1=2 MnO 3 (R ¼ La À Sm, A ¼ Ca, Sr) family. V C 2012 American Institute of Physics.

Structural, Electrical, and Colossal Thermoelectric Properties of Dy1−xSr x MnO3 Manganites

“…studies have also demonstrated that the electrical and magnetic properties strongly depend on the cation size and the disorder effect at the A site [15,20]. From application point of view, such studies are important as size mismatch between ionic radii of substituted and substituent elements is damaging to the CMR properties of these manganites.…”