Biennial Report 2005-2007 - Saha Institute of Nuclear Physics
Biennial Report 2005-2007 - Saha Institute of Nuclear Physics
Biennial Report 2005-2007 - Saha Institute of Nuclear Physics
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4 Condensed Matter <strong>Physics</strong>Experiments in Condensed Matter <strong>Physics</strong> involved mainly the physical property studieson samples <strong>of</strong> intermetallic compounds and various oxide systems in bulk and smalldimension forms using both microscopic tools such as X-ray diffraction, electron microscopy,nuclear magnetic resonance (NMR), Mossbauer spectroscopy and macroscopicstudies <strong>of</strong> transport properties and magnetic susceptibilities using SQUID magnetometer.Structural, transport, electronic and magnetic properties <strong>of</strong> rare-earth transitionmetal borides and borocarbides belonging to perovskite structure have been studied.Magnetic properties near the ground state <strong>of</strong> rare-earth based ternary intermetalliccompounds have been probed by NMR studies. NMR studies have also elucidated magneticinteractions and spin-gap in a quasi-one-dimensional quantum spin system. Sparkplasma sintered Sm-Co/Fe bulk nanocomposite magnet has been characterized. Domainwall contribution to the magetocaloric effect (MCE) and magnetoresistance (MR) havebeen compared in GdPt 2 . Inverse magnetoresistance (MR) has been observed in magnetictunnel junctions with pinhole nanocontacts. Structural, transport and magneticproperties as well as magnetic relaxation have been studied in various spinel oxides,and perovskites such as, manganates, cobaltates and cuprates. Experiments have alsobeen performed on nanoparticles and film depositions <strong>of</strong> these materials showing temperaturedependent variation <strong>of</strong> electrical properties, and magnetic phenomena suchas, superparamagnetism and magnetic glass. Single crystals <strong>of</strong> multiferroic magnateshave been prepared and their physical properties studied. Studies <strong>of</strong> rotational andvibrational states in organic molecules and transient species have now been extendedto millimeter-wave range. Numerical study <strong>of</strong> waveform distortion caused by variousfactors in a finite sized propagating medium has been performed using propagating wavemodel. Method <strong>of</strong> Monte-Carlo simulation has been used to study dynamics and phasetransformation in two-dimensional atomic or ionic systemsThe Theoretical Condensed Matter <strong>Physics</strong> studies concentrated mainly on Bose Condensation,quantum annealing, nanoscopic systems and graphene junctions. The statmechstudies cemtred around models <strong>of</strong> econophysics and catastropic failures. Someresults on tunneling conductance in graphene normal metal insulator-superconductorjunctionss, quantum annealing in spin glasses and an exact result for econophysics <strong>of</strong>wealth distribution in the kinetic exchange-like models have already been appreciatedin the literature.103
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