• K B Garg

      Articles written in Pramana – Journal of Physics

    • XANES and EXAFS study of some metal-metalloid glasses

      K B Garg Kavita S Jerath H S Chauhan Usha Chandra

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      XANES and EXAFS techniques are proving very popular in the study of local environment in disordered systems. Results of such studies in a large number of metal (Fe, Co, Ni, etc)-metalloid (B, Si, C, etc) glasses are reported. Experiments were done with synchrotron radiation as well as an x-ray tube. The values of bond lengths and co-ordination numbers computed from one-electron single scattering Fourier transform method turn out substantially smaller. The values of bondlength determined from the other EXAFS calculation method and the multiple-scattering computation scheme show good agreement. Importance of choice of suitable reference materials for analysis of data is emphasized.

    • XANES and EXAFS in Cu-Ti and Ni-Zr glasses

      K B Garg K S Jerath H S Chauhan U Chandra R K Singhal K V R Rao

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      X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) measurements have been done at the K-edge of Cu in Cu-Ti glasses and on the K-edges of Ni and Zr in Ni-Zr glasses using a synchrotron radiation source. The results are discussed in terms of the shape shift and intensity of the absorption edge as well as the principal absorption maximum. The values of bondlength calculated by the one-electron multiple scattering XANES theory as well as the graphical analysis EXAFS technique show good agreement.

    • Electronic structure of a superconducting Bi2212 crystal by angle resolved ultra violet photoemission

      N L Saini J Kanski P Srivastava L Ilver K B Garg S Durcok

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      The electronic structure of a high quality superconducting Bi2Sr2CaCu2O8+δ (Bi2212) single crystal is studied by angle resolved ultra violet photoemission (ARUPS) using He I (21.2 eV). Our results appear to show two bands crossing the Fermi level in ΓX direction of the Brillouin zone as reported by Takahashiet al. The bands at higher binding energy do not show any appreciable dispersion. The nature of the states near the Fermi level is discussed and the observed band structure is compared with the band structure calculations.

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