Behaviour of Magnetic Susceptibility and Current Density in Y, Bi &Tl- Based High Temperature Superconductors

Dr. Pawan Kumar

Associate Prof., Department of  Physics, A.S. (P.G.) College, Sikandrabad, U.P., India.

The critical current density in Y,Bi,&Tl- based  superconductors has been measured over the magnetic field. The variation of AC susceptibility for these samples with temperature has been depicted. The curves have been normalised to flat regions of the characteristics at temperature far above and below  T_c.

Keywords: Electrical resistivity,magnetic susceptibility,phase transition.

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Spectral Absorption Study in OPV Device

Dr. Hemant Kumar

Government Degree College, Kasganj, UP, India.

hemantamu@gmail

We have studied the UV-Visible absorption spectrum of copper phthalocyanine (CuPc), zinc phthalocyanine (ZnPc) and Metal free phthalocyanine (Hydrogen Phthalocyanine – H₂Pc). We also study the effect of CuPc, ZuPc and H₂Pc as donar layer in (CuPc)/ fullerene (C₆₀), (ZuPc)/ (C₆₀) and (H₂Pc)/ (C₆₀) bilayer organic photovoltaic device (OPV) or Organic Solar Cell (OSCs), the enhancement of the overall performance of the OSCs with better spectral absorption. A variation in Efficiency in the device architecture has been observed. The variation in η is dominantly attributed to the increment in short circuit current density (J_sc) due to efficient photon harvesting by donor.

Keywords: Phthylocyanine, Bilayer OPV, UV-Visible spectrum.

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The RF Stimulated Hall Potentials in High Temperature
Superconductors YBa₂Cu₃O₇

Pawan Kumar^1,* and Vaibhav Jain²

^1,*Associate Prof., Department of Physics, A.S. (P.G.) College, Sikanderabad, India

²Associate Prof., Department of Physics, DAV (P.G.) College, Bulandshahr, India

The Hall potentials had been recorded under radio-frequency (2-5.2 MHz range) perturbation which is found conventionally synthesized HTS Y₁₂₃ at room temperature. The Hall coefficient R_H and electrical carrier density N_H had been computed and is found to be in the semiconductor range of the order of 10^-14 and 10¹³ respectively.

Keywords: Hall Potential, Perturbation, High temperature superconductors (HTS), Hall coefficient.

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