Tuning the Superconducting Properties of Magnesium Diboride by Rudeger Heinrich Theoderich Wilke; Ames Laboratory.; United
By Rudeger Heinrich Theoderich Wilke; Ames Laboratory.; United States. Dept. of Energy. Office of Scientific and Technical Information.; USDOE Office of Science and Technology (OST) - (EM-50)
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Extra resources for Tuning the Superconducting Properties of Magnesium Diboride
Example text
Magnetization shows less discrepancy in T, than resistive measurements, but differences in homogeneity within the sample still manifest themselves. 9. 17 below). 038 carbon doped sample. Defining the upper critical field using the onset criteria, Hcz values are comparable for all temperatures in the undoped case. In addition, for both x=Q038 carbon doped samples, HQ values converge at lower temperatures for the two synthesis techniques. 12 below). lies in the width of the transitions. -2. 10 Comparison of in-field resistive transitions for the two types of reaction profiles.
B) and (c) Optical and BSE images of 15ccpni fibei ieactcd fol 24 houls at 1100 O C . There is only a small ring of MgB4 within the fiber. The WzBs core is approximately 18pm in diameter and serves as an internal caliper for the optical images. 3 (a) 15 ccpm carbon doped filament reacted for 24 hours at 1200 OC. Small regions of MgB4 are still present and can be most clearly seen in the BSE micrograph. (b) 60 cppm fiber reacted at 1200 'C for 48 hours. The wire is fully converted to MgB2. The WZBScore is approximately 18 pm in diameter and serves as an internal caliper for the optical images.
052 in Mg(BI-,C,)2 wires grown with the 650 "C - 1200 OC over 96 hours ramping profile. ducting, when a continuous superconducting path is established (76). Magnetization shows less discrepancy in T, than resistive measurements, but differences in homogeneity within the sample still manifest themselves. 9. 17 below). 038 carbon doped sample. Defining the upper critical field using the onset criteria, Hcz values are comparable for all temperatures in the undoped case. In addition, for both x=Q038 carbon doped samples, HQ values converge at lower temperatures for the two synthesis techniques.