Physical Properties of Holmium Promoted Superconductivity in Nd-Doped YBCO HT_C-Superconductors

Authors

MORSY ABOU SEKKINA
ABDUL RAOUF TAWFIK
OSAMA HEMEDA
MOHAMAD AHMAD TAHER DAWOUD
SAMY EL-ATTAR

DOI

-

Abstract

Samples of the nominal composition (Y_{0.5}Nd_{0.5-x}Ho_x) Ba_2Cu_3O_{7- \delta} , 0 \le x \le 0.5, have been prepared using the conventional solid state reaction. The effect of holmium and neodymium substitution on electrical resistivity, transition temperature T_c, lattice parameters, size of crystallite and grain size has been investigated. X-ray diffraction, electron micro-probe, scanning electron microscope and IR spectra, have been used in our investigation. The results show that the transition temperature T_c, electron-hole jump rate and lattice parameters (a, b) have minimum values at x = 0.2, while c increases to maximum at x = 0.2. The size of crystallite, the electrical resistivity and grain size are also maximum at x = 0.2. The real composition, molecular state and electronic state of the prepared samples are discussed.

Keywords

Superconductors; X-ray; IR-spectra; YBCO; Ho; Nd.

First Page

329

Last Page

340

Recommended Citation

SEKKINA, MORSY ABOU; TAWFIK, ABDUL RAOUF; HEMEDA, OSAMA; DAWOUD, MOHAMAD AHMAD TAHER; and EL-ATTAR, SAMY (2005) "Physical Properties of Holmium Promoted Superconductivity in Nd-Doped YBCO HT_C-Superconductors," Turkish Journal of Physics: Vol. 29: No. 6, Article 1. Available at: https://journals.tubitak.gov.tr/physics/vol29/iss6/1