The current activity of our group is to experimentally study unusual phase transitions, like quantum phase transition and low-T magnetic instabilities in Laves phase compounds, and unusual phases, like quantum Griffiths phase and topologically insulating phase, in bulk and nanodimensional systems. We employ basically arc-melting for bulk sample preparation and chemical methods for nanoparticles. We employ also highly energetic heavy ions of ~ 100 MeV energy to modify these materials to display non-conventional properties, and are studying the fundamental ion-matter interaction mechanisms through such studies. We are also actively using such ions to perform Perturbed Angular Distribution (PAD) studies of local electronic and magnetic properties of isolated impurities in solids. Via this method, we try to explain unusual behaviours of certain solids. We are also engaged in performing first-principles density functional theory (DFT) computations of electronic and magnetic properties of solids to axploit it to explain our experimental results.
Quantum phase transition and Fermi liquid behavior in Pd1−xNix nanoalloys by Swain, P., Srivastava, Sunil K. and Srivastava, Sanjeev K. Phys. Rev. B 91 - (2015)
Test of the hypothesis of transient molten state diffusion for swift heavy ion induced interface mixing by Srivastava, S.K., Avasthi, D.K., Assmann, W., Wang, Z.G., Kucal, H., Jacquet, E., Carstanjen, H.D. and Toulemonde, M. Phys. Rev. B 71 - (2005)
Transient enhanced diffusion of oxygen in Fe mediated by large electronic excitation by Avasthi, D.K., Assmann, W., Tripathi, A., Srivastava, S.K., Ghosh, S., Grüner, F. and Toulemonde, M. Phys. Rev. B 68 - (2003)
Swift heavy ion induced formation of nano columns of carbon clusters in a Si based polymer by Srivastava, S.K., Avasthi, D.K. and Pippel, E. Nanotechnology 17 - (2006)
Electronic structure and local magnetism of 3d5d impurity substituted CeFe2 by Das, Rakesh, Das, G.P. and Srivastava, S.K. J. Phys. D: Appl. Phys. 49 - (2016)
Magnetic behaviour of isolated Cu impurities in Cr: experiment and theory by Srivastava, S.K. and Mishra, S.N. J. Phys.: Cond. Matter 20 - (2008)
Spin fluctuations of isolated Fe impurities in Pd based dilute alloys: Effect of ferromagnetic host spin polarization by Srivastava, S.K., Mishra, S.N. and Das, G.P. J. Phys.: Cond. Matter 18 - (2006)
Synthesis of an embedded metal nanoparticle planar assembly by low-energy ion irradiation of a thin discontinuous metal film sandwiched in silica by Khan, Saif A., Srivastava, S.K., and Avasthi, D.K. J. Phys. D: Appl. Phys. 45 - (2012)
Defect induced magnetism in highly oriented pyrolytic graphite (HOPG) by 19F hyperfine interaction by Mohanta, S.K., Mishra, S.N., Davane, S.M. and Srivastava, S.K. J. Phys.: Cond. Matter 24 - (2012)
Electronic structure and magnetic properties of 3d impurities in antiferromagnetic Cr by Mishra, S.N. and Srivastava, S.K. J. Phys.: Cond. Matter 20 - (2008)
Area of Research: Quantum criticality.
Area of Research: Alloy nanoparticles.
Area of Research: Quantum phase transitions
Area of Research: Nanostructuring of Surface
Area of Research: Phase transitions in metallic nanoalloys.