A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Satyabrata Raj

PhD:
IOP / Utkal University (2001)
Area of Interest:
Condensed Matter Physics (Experimental)
Email ID:
raj
Research Interest:

Our research activity is mainly related to the study of electronic structure of strongly correlated systems by Angle-Resolved Photo-Emission Spectroscopy (ARPES).

We study (i) Metal-Insulator Transition (MIT) in transition metal oxides (ii) Mechanism of superconductivity in high-Tc superconductors (iii) Electronic structure of manganites showing CMR (iv) Superconductivity in Heavy Fermions (v) Low-dimensional systems showing charge-density wave (CDW), (vi) Electronic structure of the novel nano materials, super-ultra-thin films and/or one-dimensional chains etc.

Academic Qualification:
  • M. Sc. (Physics), Utkal University, 1996.
  • Ph. D. (Experimental Physics), IOP / Utkal University, 2001.
Positions:
  • Research Associate, Indian Institute of Science, Bangalore, India (2001 - 2004).
  • COE Fellow, Tohoku University, Sendai, Japan (2004 - 2006).
  • JSPS Fellow, Tohoku University, Sendai, Japan (2006 - 2008).
  • Visiting Associate Professor, WPI Research Center - AIMR, Tohoku University, Sendai, Japan (Jan ~ Mar, 2009)
  • Assistant Professor, Indian Institute of Science Education and Research (IISER) Kolkata (2008 - 2013).
  • Associate Professor, Indian Institute of Science Education and Research (IISER) Kolkata (2013 - till).
List of Publications:
  1. High pressure investigations of Na0.025WO3: x-ray diffraction and Raman spectroscopy studies; A. Basu, S. Paul, M. Polentarutti, G. Bais, S. Oishi, S. Raj and G. D. Mukherjee, J. Phys.: Condens. Matter 23 365401 (2011).

  2. Temperature dependent x-ray diffraction study of lightly doped NaxWO3; S. Paul, G. D. Mukherjee, A. Ghosh, S. Oishi, and S. Raj, Appl. Phys. Lett. 98, 121910 (2011).

  3. Metal - insulator transition in sodium tungsten bronzes, NaxWO3 studied by angle - resolved photoemission spectroscopy; S. Raj, T. Sato, S. Souma, T. Takahashi, D. D. Sarma, and P. Mahadevan, Mod. Phys. Lett. B 23, 2819 (2009).

  4. Three-dimensional band structure of highly metallic Na0.8WO3 by angle-resolved photoemission spectroscopy; S. Raj, A. Chakraborty, D. Choudhury, T. Sato, T. Takahashi, Priya Mahadevan, J. Fujii, I. Vobornik, and D.D. Sarma, Phys. Rev. B 79, 035119 (2009).

  5. Direct evidence for hidden one-dimensional Fermi surface of hexagonal K0.25WO3 ; S. Raj, T. Sato, S. Souma, T. Takahashi, D.D. Sarma, P. Mahadevan, J. C. Campuzano, M. Greenblatt, and W. H. McCarroll, Phys. Rev. B 77, 245120 (2008).

  6. Band structure and Fermi surface of heavy Fermion compounds Ce2TIn8 (T = Co, Rh, In) studied by angle-resolved photoemission spectroscopy; S. Souma, S. Raj, J.C. Campuzano, T. Sato, T. Takahashi, S. Ohara, and S. Sakamoto, Physica B 403, 752 (2008).

  7. Xenon-plasma-light low-energy ultrahigh-resolution photoemission study of Co(S1-xSex)2 (x = 0.075); T. Sato, S. Souma, K. Sugawara, K. Nakayama, S. Raj, H. Hiraka, and T. Takahashi), Phys. Rev. B 76, 113102 (2007).

  8. Electronic structure of sodium tungsten bronzes NaxWO3 by high-resolution angle resolved photoemission spectroscopy; S. Raj, H. Matsui, S. Souma, T. Sato, T. Takahashi, A. Chakraborty, D.D. Sarma, P. Mahadevan, S. Oishi, W. H. McCarroll, and M. Greenblatt, Phys. Rev. B 75, 155116 (2007).

  9. Metal - insulator transition in sodium tungsten bronzes, NaxWO3 studied by angle-resolved photoemission spectroscopy; S. Raj, D. Hashimoto, H. Matsui, S. Souma, T. Sato, T. Takahashi, S. Ray, A. Chakraborty, D. D. Sarma, P. Mahadevan, S. Oishi, W. H. McCarroll, and M. Greenblatt, J. Magn. Magn. Mater. 310, e231 (2007).

  10. Angle-resolved photoemission spectroscopy of the insulating NaxWO3 : Anderson localization, polaron formation, and remnant Fermi surface; S. Raj, D. Hashimoto, H. Matsui, S. Souma, T. Sato, T. Takahashi, D.D. Sarma, Priya Mahadevan, and S. Oishi, Phys. Rev. Lett. 96, 147603 (2006).

  11. A microspectroscopic study of the electronic homogeneity of ordered and disordered Sr2FeMoO6 ; D. Topwal, U. Manju, Sugata Ray, S. Raj, D.D. Sarma, S.R. Krishnakumar, M. Bertolo, S. La Rosa, and G. Cautero, J. Chem. Sci. 118, 87 (2006).

  12. Angle-resolved photoemission spectroscopy on metallic sodium tungsten bronzes NaxWO3 ; S. Raj, D. Hashimoto, H. Matsui, S. Souma, T. Sato, T. Takahashi, Sugata Ray, A. Chakraborty, D. D. Sarma, Priya Mahadevan, W. H. McCarroll, and M. Greenblatt, Phys. Rev. B 72, 125125 (2005).

  13. Angle-resolved and resonant photoemission spectroscopy on heavy-fermion superconductors Ce2CoIn8 and Ce2RhIn8 ; S. Raj, Y. Iida, S. Souma, T. Sato, T. Takahashi, H. Ding, S. Ohara, T. Hayakawa, G. F. Chen, I. Sakamoto, and H. Harima, Phys. Rev. B 71, 224516 (2005).

  14. Optimization of a low energy, high brightness electron gun for inverse photoemission spectrometers; S. Raj and D.D. Sarma, Rev. Sci. Instrum. 75, 1020 (2004).

  15. Electron spectroscopic investigation of metal-insulator transition in Ce(1-x)SrxTiO3 ; Manju U., S. R. Krishnakumar, Sugata Ray, S. Raj, M. Onoda, C. Carbone, and D.D. Sarma,  J. Chem. Sci. 115, 491 (2003).

  16. Studies in the valence electronic structure of Fe and Ni in FexNi(1-x) alloys; D. K. Basa, S. Raj, H.C. Padhi, M. Polasik, and F. Pawlowski, Pramana 58, 783 (2002).

  17. Relative K x-ray intensity studies of the valence electronic structure of 3d-transition metals; S. Raj, H.C. Padhi, P. Palit, D.K. Basa, M. Polasik, and F. Pawlowski, Phys. Rev. B 65, 193105 (2002).

  18. Valence electronic structure of Ti, Cr, Fe and Co in some alloys from Kβ - to - Kα x-ray intensity ratio studies; F. Pawlowski, M. Polasik, S. Raj, H.C. Padhi, and D.K. Basa, Nucl. Instrum. Methods Phys. Res. B 195, 367 (2002).

  19. Kβ - to - Kα x-ray intensity ratio studies of the valence electronic structure of Fe and Ni in FexNi(1-x) alloys; S. Raj, H.C. Padhi, M. Polasik, F. Pawlowski and D.K. Basa, Phys. Rev. B 63, 73109 (2001).

  20. Valence electronic structure of Mn in undoped and doped lanthanum manganites from relative K x-ray intensity studies; S. Raj, H.C. Padhi, P. Raychaudhuri, A.K. Nigam, R. Pinto, M. Polasik, F. Pawlowski, and D.K. Basa, Nucl. Instrum. Methods Phys. Res. B 174, 344  (2001).

  21. Valence electronic structureof Fe and Ni in FexNi(1-x) alloys from relative K x-ray intensity studies; S. Raj, H.C. Padhi, M. Polasik, F. Pawloski, and D.K. Basa, Solid State Commun. 116, 563 (2000).

  22. Kβ - to - Kα x-ray intensity ratio studies on the valence electronic states of 3d-transition metals in some of their compounds; F. Pawlowski, M. Polasik, S. Raj, and H. C. Padhi, Acta Physica Polonica B 31, 495 (2000).

  23. Influence of chemical effect on the Kβ - to - Kα x-ray intensity ratios of Cr, Mn and Co in CrSe, MnSe, MnS and CoS; S. Raj, H.C. Padhi and M. Polasik, Nucl. Instrum. Methods Phys. Res. B 160, 443 (2000).

  24. Simultaneous L- and M-shell ionization of a 80Se target deduced from the analysis of energy shifts and relative intensities of K x-ray lines induced by various projectiles; M. Polasik, S. Raj, B.B. Dhal, H.C. Padhi, A.K. Saha, M.B. Kurup, K.G. Prasad, and P.N. Tandon, J. Phys. B: At. Mol. Phys. 32, 3711 (1999).

  25. Influence of alloying effect on Kβ - to - Kα X-ray intensity ratios of V and Ni in VxNi(1-x) alloys; S. Raj, H.C. Padhi and M. Polasik, Nucl. Instrum. Methods Phys. Res. B 155, 143 (1999).

  26. Kβ - to - Kα x-ray intensity ratio studies on the changes of valence electronic structures of Ti, V, Cr, and Co in their disilicide compounds; S. Raj, H.C. Padhi, D.K. Basa, M. Polasik, and F. Pawlowski, Nucl. Instrum. Methods Phys. Res. B 152, 417 (1999).

  27. Charge transfer studies in V3Si, Cr3Si and FeSi; S. Raj, H.C. Padhi, M. Polasik, and D.K. Basa, Solid State Commun. 110, 275 (1999).

  28. Evidence in favor of no appreciable Cu(3d)-O(2p) hybridization in undoped and Zn doped YBCO super-conductors; S. Raj, B.B. Dhal, H.C. Padhi, D. Behera, and N.C. Mishra, Solid State Commun. 105, 767 (1998).

  29. Influence of chemical effect on the Kβ - to - Kα intensity ratios of Ti, V, Cr, and Fe in TiC, VC, CrB, CrB2 and FeB; S. Raj, H.C. Padhi and M. Polasik, Nucl. Instrum. Methods Phys. Res. B 145, 485 (1998).

  30. Influence of solid-state effects on the Kβ - to - Kα x-ray intensity ratios of Ni and Cu in various silicide compounds; S. Raj, B.B. Dhal, H.C. Padhi, and M. Polasik, Phys. Rev. B 58, 9025 (1998).