Probing the Perovskite Oxides: An Optical and Magnetic Study
School of Material Sciences
Indian Association for the Cultivation of Science, Kolkata
Perovskite oxides (with general structure ABO3) show unusual property modification due to aliovalent doping. In the first part of the seminar, I plan to discuss regarding the defect and optical properties of Sb doped and hydrogenated BaSnO3. Both Sb+5 and hydrogen dopant enhance the optical band gap. Our most crucial finding is the appearance of local vibrational modes due to hydrogenation and the identification of charge states of hydrogen. The existence of intrinsic defects, e.g., oxygen vacancy has been extensively investigated by EPR technique.
In the second part, I plan to shed light on optical and magnetic properties of Sr doped GdCrO3 samples. Quantitative structural analysis and vibrational spectroscopy are used to investigate solid solubility of Sr+2 ion in Gd1-xSrxCrO3 samples. Larger cell volume and breaking of magnetic exchange pathways through nonmagnetic element (Sr) weaken the interaction strength which consequently lower Neel and spin reorientation temperatures. Presence of mixed valence sate of Cr induces a reduction of optical band gap with increase of Sr content. The most significant observation is that the dopant Sr enhances coercivity.
The seminar will take place via Zoom. The details for connecting to the meeting can be found below:
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Meeting ID: 970 4699 5988
Calendar of upcoming seminars
|Date||Name||Topic of the seminar|
|25.2.2021||Luka Cmok||Taming Liquid Crystal Elastomers|
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