R J Singh
Articles written in Pramana – Journal of Physics
Volume 16 Issue 6 June 1981 pp 511-518 Solid State Physics
Frequency dependence of the surface states at the N-type Si-SiO2 interface
The response of the surface states at the
Volume 18 Issue 2 February 1982 pp 137-143 Solid State Physics
Distribution of surface states based on Hill and Coleman conductance technique
Hill-Coleman’s single frequency conductance technique for the determination of surface state density has been extended upto 2 kHz. A.c. conductance (
Volume 58 Issue 5-6 May 2002 pp 843-848 Superconductivity
EPR study of deoxygenated high-temperature superconductors
R J Singh P K Sharma Shakeel Khan
High-
The spectra recorded have been identified to be due to (1) Cu-monomer, (2) Cu-dimer, (3) Cu-tetramer, (4) Cu-octamer and (5) one signal at very low field which could not be identified because there was no structure in it and may be due to fragments higher than octamers. Very big fragments do not give any spectra because the original AF order probably remains intact in them. It is expected that when the fragments become magnetically isolated from the bulk, they produce EPR spectra. Most of the spectra have been analyzed and their spin-Hamiltonian parameters determined. The spectra of these species vary a little in terms of g-value and fine-structure splitting constant from sample to sample or even in the same sample and this may be attributed to some extra oxygen attachments retained with these species. Most frequently occurring species is the Cu-tetramer, (CuO)4. As (CuO)4 represents the unit cell of the all important two-dimensional CuO2 plane of the high-
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