Shrikant Narayan Ekbote

Effect of Electromagnetic Interactions on the Undulatory Temperature Dependent Behaviour of Non-Resonant Microwave Absorption Signal Amplitude in Bi2Sr2CaCu2O8+x

c � 96 K) while increasing temperature from 15 to 105 K has been investigated and discussed. These studies show an undulatory behavior of an initial fall in the amplitude (15 – 71.8 K) with a subsequent narrow weak temperature independent region (71.8 – 75.6 K) and then a rise peaking at � 82:5 K followed by a final exponential fall (82.5 –105 K). A detailed discussion on earlier reported data has suggested that this undulatory behavior cannot be understood in terms of existing approaches involving effect of Josephson interactions (JI) alone among vortices. In our opinion, the entire undulatory behavior observed in the present samples can be explained with the inclusion of electromagnetic interaction (EMI) along with JI. [DOI: 10.1143/JJAP.45.84]

Comparative Study of Effect of Initial Sintering in Rod/Tube Shape on Jc and Fracture Strength of Bi-2223: 10 wt % Ag Bulk Rod Conductors

The effect of two different initial sintering routes, (1) initial sintering in the rod shape (RS) and (2) initial sintering in the tube shape (TS), has been studied especially on the critical current density (Jc) and diametric fracture strength (σ) of Bi-2223 as 10 wt % Ag bulk rod conductors from a cold isostatic pressing (CIP) process. Apart from studying Jc and σ, these rods have been characterized by X-ray diffraction (XRD), energy dispersive analysis for X-rays (EDAX) and scanning electron microscopy (SEM). These studies showed that the final Bi-2223 rods achieved using the tube shape initial sintering route (TSR) in a for shorter duration exhibit higher Jc and σ values compared with final rods prepared from the rod shape using the initial sintering route (RSR).