IITKGP

Sanjeev Kumar Srivastava

Professor

Physics

+91-3222-283854

sanjeev@phy.iitkgp.ac.in

Responsibilities

  • Coordinating Warden, HMC (Maintenance)

Research Areas

  • Swift heavy ion-matter interaction
  • Local Magnetism
  • Quantum phase transitions & criticality
  • Density Functional Theory for Solids
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 Swain, P., Srivastava, Sunil K. and Srivastava, Sanjeev K. By Phys. Rev. B 91 - (2015)
  • Electronic structure and magnetic properties of 3d impurities in antiferromagnetic Cr Mishra, S.N. and Srivastava, S.K. By J. Phys.: Cond. Matter 20 - (2008)
  • Test of the hypothesis of transient molten state diffusion for swift heavy ion induced interface mixing Srivastava, S.K., Avasthi, D.K., Assmann, W., Wang, Z.G., Kucal, H., Jacquet, E., Carstanjen, H.D. and Toulemonde, M. By Phys. Rev. B 71 - (2005)
  • Transient enhanced diffusion of oxygen in Fe mediated by large electronic excitation Avasthi, D.K., Assmann, W., Tripathi, A., Srivastava, S.K., Ghosh, S., Grüner, F. and Toulemonde, M. By Phys. Rev. B 68 - (2003)
  • Swift heavy ion induced formation of nano columns of carbon clusters in a Si based polymer Srivastava, S.K., Avasthi, D.K. and Pippel, E. By Nanotechnology 17 - (2006)
  • Electronic structure and local magnetism of 3d5d impurity substituted CeFe2 Das, Rakesh, Das, G.P. and Srivastava, S.K. By J. Phys. D: Appl. Phys. 49 - (2016)
  • Magnetic behaviour of isolated Cu impurities in Cr: experiment and theory Srivastava, S.K. and Mishra, S.N. By J. Phys.: Cond. Matter 20 - (2008)
  • Spin fluctuations of isolated Fe impurities in Pd based dilute alloys: Effect of ferromagnetic host spin polarization Srivastava, S.K., Mishra, S.N. and Das, G.P. By 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 Khan, Saif A., Srivastava, S.K., and Avasthi, D.K. By J. Phys. D: Appl. Phys. 45 - (2012)
  • Defect induced magnetism in highly oriented pyrolytic graphite (HOPG) by 19F hyperfine interaction Mohanta, S.K., Mishra, S.N., Davane, S.M. and Srivastava, S.K. By J. Phys.: Cond. Matter 24 - (2012)
  • Co-Principal Investigator

Ph. D. Students

Bipasha Das

Area of Research: Nanostructuring of Surface

Paritosh Maity

Area of Research: Density Functional Theory for Solids

Shaona Bose

Area of Research: 2D Heterostructures

Subhadip Ghosh

Area of Research: Phase transitions in metallic nanoalloys.