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રાજકોટ જિલ્લાના ગ્રામ કારીગરોની સમસ્યાઓ અને ભાવિ
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Growth, Characterization, Vortex Pinning and Vortex Flow Properties of Single Crystals of Iron Chalcogenide Superconductor FeCrSe
We report the growth and characterization of single crystals of iron
chalcogenide superconductor FeCrSe. There is an enhancement of the
superconducting transition temperature (T) as compared to the T of the single crystals of the parent compound FeSe by about 25%.
The superconducting parameters such as the critical fields, coherence length,
penetration depth and the Ginzburg-Landau parameter have been estimated for
these single crystals. Analysis of the critical current data suggests a
fluctuation in electronic mean free path induced () pinning mechanism
in this material. Thermally activated transport across the superconducting
transition in the presence of external magnetic fields suggests a crossover
from a single vortex pinning regime at low fields to a collective flux creep
regime at higher magnetic fields. The nature of charge carriers in the normal
state estimated from the Hall effect and thermal transport measurements could
provide crucial information on the mechanism of superconductivity in Fe-based
materials.Comment: 2 additional figures, additional discussion on nature of charge
carrier
BVRI CCD photometric standards in the field of GRB 990123
The CCD magnitudes in Johnson and Cousins photometric passbands are
determined for 18 stars in the field of GRB 990123. These measurements can be
used in carrying out precise CCD photometry of the optical transient of GRB
990123 using differential photometric techniques during non--photometric sky
conditions. A comparison with previous photometry indicates that the present
photmetry is more precise.Comment: Tex file, 5 pages with 1 figure. Bull. Astron. Society India, Vol. 27
(accepted
Geotechnical Characterization of Grout Mix For Curtain Grouting
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv
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