Browsing Department of Physics by Author "Kumar, S."

Browsing Department of Physics by Author "Kumar, S."

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  • Anomalous and topological Hall effect in Cu doped Sb2Te3topological insulator 
    Singh, A.; Gangwar, V.K.; Shahi, P.; Pal, D.; Singh, R.; Kumar, S.; Singh, S.; Gupta, S.K.; Kumar, S.K.; Kumar, S.; Cheng, J. (American Institute of Physics Inc., 2020-08-31)
    The magneto-transport and magnetization measurements of Sb1.90Cu0.10Te3 were performed by varying both temperature and the magnetic field. The induced antiferromagnetic ordering with Cu doping and the observed quantum ...
  • Defect induced ferromagnetic ordering and room temperature negative magnetoresistance in MoTeP 
    Pal, D.; Kumar, S.; Shahi, P.; Dan, S.; Verma, A.; Gangwar, V.K.; Singh, M.; Chakravarty, S.; Uwatoko, Y.; Saha, S.; Patil, S.; Chatterjee, S. (NLM (Medline), 2021-04-27)
    The magneto-transport, magnetization and theoretical electronic-structure have been investigated on type-II Weyl semimetallic MoTeP. The ferromagnetic ordering is observed in the studied sample and it has been shown that ...
  • Effects of molecular crowding on stretching of polymers in poor solvent 
    Singh, A.R.; Giri, D.; Kumar, S. (2009-05-11)
    We consider a linear polymer chain in a disordered environment modeled by percolation clusters on a square lattice. The disordered environment is meant to roughly represent molecular crowding as seen in cells. The model ...
  • Electronic structure by X-ray absorption spectroscopy and observation of field induced unusually slow spin relaxation from magnetic properties in pyrochlore 
    Pal, A.; Ghosh, S.; Kumar, S.; Schwier, E.F.; Sawada, M.; Shimada, K.; Gupta, M.; Phase, D.M.; Ghosh, A.K.; Chatterjee, S. (Elsevier B.V., 2019-04-15)
    X-ray absorption spectroscopy (XAS) and magnetization of hybrid pyrochlore Eu2-xFexTi2O7 (EFTO) were investigated, where the rare earth Eu (4f) was replaced with transition metal Fe (3d) to introduce competing 4f-3d ...
  • Force induced melting of the constrained DNA 
    Singh, A.R.; Giri, D.; Kumar, S. (2010-06-21)
    We develop a simple model to study the effects of the applied force on the melting of a double stranded DNA (dsDNA). Using this model, we could study the stretching, unzipping, rupture and slippagelike transition in a ...
  • Force induced unfolding of biopolymers in a cellular environment: A model study 
    Singh, A.R.; Giri, D.; Kumar, S. (2009)
    Effect of molecular crowding and confinement experienced by protein in the cell during unfolding has been studied by modeling a linear polymer chain on a percolation cluster. It is known that internal structure of the cell ...
  • Observation of rotation about the longest principal axis in Zr 89 
    Saha, S.; Palit, R.; Sethi, J.; Biswas, S.; Singh, P.; Nag, S.; Singh, A.K.; Ragnarsson, I.; Babra, F.S.; Garg, U.; Goswami, A.; Ideguchi, E.; Jain, H.C.; Kumar, S.; Laskar, M.S.R.; Mukherjee, G.; Naik, Z.; Palshetkar, C.S. (American Physical Society, 2020-05-03)
    High-spin states in Zr89 were populated in the Se80(C13,4n) reaction, and γ-ray coincidences were measured using the Indian National Gamma Array. The level scheme of Zr89 has been extended up to spin I=49/2 with the ...
  • Role of loop entropy in the force induced melting of DNA hairpin 
    Mishra, G.; Giri, D.; Li, M.S.; Kumar, S. (2011-07-21)
    Dynamics of a single stranded DNA, which can form a hairpin have been studied in the constant force ensemble. Using Langevin dynamics simulations, we obtained the force-temperature diagram, which differs from the theoretical ...
  • Role of pulling direction in understanding the energy landscape of proteins 
    Rajesh, R.; Giri, D.; Jensen, I.; Kumar, S. (2008-08-13)
    Single-molecule force spectroscopy provide details of the underlying energy surfaces of proteins which are essential to the understanding of their unfolding process. Recently, it has been observed experimentally that by ...
  • Roles of Re-entrant cluster glass state and spin-lattice coupling in magneto-dielectric behavior of giant dielectric double perovskite La1.8Pr0.2CoFeO6 
    Singh, P.; Alam, M.; Kumar, S.; Anand, K.; Gangwar, V.K.; Ghosh, S.; Sawada, M.; Shimada, K.; Singh, R.K.; Ghosh, A.K.; Chatterjee, S. (Institute of Physics Publishing, 2020-10-21)
    La based Co-Fe combined double perovskite (La1.8Pr0.2CoFeO6) was synthesized and the dielectric (zero-field and in-field), magnetic, X-ray absorption and Raman spectroscopy measurements have been investigated for ...
  • Room temperature exchange bias in antiferromagnetic composite BiFeO3-TbMnO3 
    Gupta, P.K.; Ghosh, S.; Kumar, S.; Pal, A.; Singh, P.; Alam, M.; Singh, A.; Roy, S.; Singh, R.; Singh, B.P.; Naveen kumar, N.; Schwier, E.F.; Sawada, M.; Matsumura, T.; Shimada, K.; Lin, H.-J.; Chin, Y.-Y.; Ghosh, A.K.; Chatterjee, S. (American Institute of Physics Inc., 2019-12-28)
    The magnetic property of a 0.7BiFeO3-0.3TbMnO3 composite has been studied in detail and compared with that of 0.8BiFeO3-0.2TbMnO3. The magnetic properties in 0.7BiFeO3-0.3TbMnO3 are improved in manifold compared to BiFeO3. ...
  • Stretching of a single-stranded DNA 
    Mishra, G.; Giri, D.; Kumar, S. (2009-03-03)
    Recent experiments have shown that the force-extension (F-x) curve for single-stranded DNA (ssDNA) consisting only of adenine [poly(dA)] is significantly different from thymine [poly(dT)]. Here, we show that the base ...

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