S K Arora
Articles written in Bulletin of Materials Science
Volume 3 Issue 1 February 1981 pp 57-65
The poor quality of natural scheelite necessitates growing these crystals in the laboratory. The flux growth method has been modified to obtain crystals of better quality. Various habits of the grown crystals are reported. The effect of the growth conditions like temperature, cooling rate, charge composition, etc. to yield different morphology has been investigated.
Volume 5 Issue 5 December 1983 pp 381-387
Single crystals of BaMoO4 have been grown by isothermal evaporation of lithium chloride at 700°C. The morphology and mechanism of growth of the crystals have been discussed. The quality of the crystal has been assessed by selective etching.
Volume 8 Issue 4 October 1986 pp 489-496
Kinetics of crystallization of calcium molybdate from unstirred molten solutions of lithium chloride of low to medium supersaturation in platinum crucibles by the process of continuous cooling at 5° C hr−1 from temperatures
Volume 14 Issue 4 August 1991 pp 1125-1129 International Conference On Superconductivity—III
Break junctions of Y-Ba-Cu-O superconductor were realized by creating fresh crack in the bar shape bulk samples mounted in a specially designed probe kept in the liquid nitrogen bath. While the bulk sample was kept static, a sharp tip of a shaft was moved downward from the outside of the dewar in order to break the sample. It was possible to change the critical current of the break junctions by adjusting pressure on the tip of the shaft. The effects of magnetic field and microwave power on the I-V characteristic of the junction were studied. The junction was found to show periodic V-B behaviour and the microwave-induced Shapiro steps were clearly observed at 77 K. The flux noise spectrum of the junction was also studied.
Volume 14 Issue 4 August 1991 pp 1131-1134 International Conference On Superconductivity—III
A two-hole rf SQUID has been fabricated out of bulk YBCO by drilling two holes and careful erosion of the wall between the holes. Commercial SQUID electronics is inductively coupled to the SQUID through a copper coil glued in one of the holes. Periodic oscillations in V-B characteristic of the SQUID are observed at 77 K. The spectral density of the flux noise in the white noise region is 5·5 × 10−4Φ0 / √Hz. The flux noise is frequency-dependent below 200 Hz.
Volume 21 Issue 4 August 1998 pp 297-301 Nucleation And Growth Studies
Large single crystals of a few important members (
Volume 22 Issue 3 May 1999 pp 251-255 High Tc Superconductors: Thin Films And Vortex Pinning
Effect of 250 MeV107Ag ion irradiation induced columnar defects on the noise properties of the YBCO superconductor in the normal and superconducting state have been investigated. Magnitude of the spectral density of the noise is found to scale inversely with the frequency and exhibit a quadratic dependence on the bias current confirming that the noise arises due to the resistance fluctuations. The magnitude of
Volume 42 | Issue 4