Study of electron transport in strongly correlated systems using pulsed magnetic field and kinetics of metal-insulator transition in V₂O₃.

Ashraf, Mohammad Arsalan (2014) Study of electron transport in strongly correlated systems using pulsed magnetic field and kinetics of metal-insulator transition in V₂O₃. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Mohammad Arsalan Ashraf) Mohammad_Arsalan_Ashraf-09MS050.pdf - Submitted Version Restricted to Repository staff only Download (4MB)

Abstract

We started this project for the study of magneto transport phenomena in strongly correlated systems in high magnetic field. For this, the first step was construction of a cryostat (77K-300K) to be used with the pulsed magnet in the laboratory. The second part involved improving the signal-to-noise ratio in the transport measurements using the pulsed magnet. For this we developed the software for digital implementation of the Lock-in technique. We have focused on the hysteresis behaviour in the metal-insulator transition in V₂O₃. While we were doing some preliminary measurements we saw dynamic hysteresis in this transition then we decided to study about the kinetics of this transition. The thesis is written in two parts, in the first part mainly about the Lock-in technique and fabrication of cryostat is discussed. In the second part kinetics of metal-insulator transition in V2O3 and the experiment we performed to study that is discussed.XRD pattern of our sample shows that our sample was pure. We observed that area of hysteresis loop in metal-insulator transition in V₂O₃ increases with increasing the sweep rate (rate change of temperature). Phase difference between reference signal and sample response shows large capacitive effect in insulating phase. Exponential relaxation for sample resistance has been observed.

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