Handbook of High Temperature Superconductor Electronics Part 13 pdf

... vapor pressure of the oil at this temperature is high enough that a significant amount of oil can still find its way to the cold end and lead to potential clogging of the cold end. The use of a small ... supercon- ductivity of the problems imposed upon it by the need for cooling. Operating temperatures of less than about two-thirds of the transition temperature are re- qui...

Ngày tải lên: 10/08/2014, 19:20

... anisotropic nature of high- temperature superconductor materials, mismatch in the lattice and thermal expansion coefficient between the superconductor and N-layer, chemical incompatibility between the superconductor ... the fabrica- tion of high- temperature superconducting ramp-edge SNS junctions and SQUIDs. 86 Jia F IGURE 3.1 Cross-sectional diagram of a ramp-edge superco...

Ngày tải lên: 10/08/2014, 19:20

... 10 High- Temperature Superconductor Microwave Devices Neeraj Khare 11 High- Temperature Superconducting IR Detectors John C. Brasunas 12 Cryocoolers and High- T c Devices Ray Radebaugh 13 High- Temperature ... Conductance Noise in High- Temperature Superconductors László Béla Kish 6 Noise in High- Temperature Superconductor Josephson Junctions J.C. Macfarlane, L. Hao, an...

Ngày tải lên: 10/08/2014, 19:20

... Symmetry of Order Parameter of High- T c Superconductors. In: A Narlikar, ed. Studies of High Temperature Superconductor vol 20 New York: Nova Science Publishers, 1996, pp 187–215. Introduction to High- Temperature ... CRYSTAL STRUCTURE OF HIGH- T c SUPERCONDUCTORS The structure of a high- T c superconductor is closely related to perovskite struc- ture. The unit cell...

Ngày tải lên: 10/08/2014, 19:20

... relationships of these materials and the high volatility of Tl ox- ides. The fabrication of thin films of the Tl-based HTS compounds involves a pre- carious balance between the high temperatures ... 1000°C. The growth temperature for liquid-phase epitaxy of YBa 2 Cu 3 O 7 can be reduced by the addition of BaF 2 to the growth flux, as seen in Figure 2 .13 (64). The temperat...

Ngày tải lên: 10/08/2014, 19:20

... alter- natively, a high- power plasma decomposition of methane. The ion-milling rate of ␣-C is slightly higher than that of the diamondlike form. Very good results in terms of a step-edge profile have ... the range of temperature between 4.2 K and the critical temperature T c of the specific junction. After removal of the YBCO stripes, by additional ion milling the I–V char...

Ngày tải lên: 10/08/2014, 19:20

... 5.3.1.1 “Bulk” Temperature Regime At the high- temperature part of the conductorn superconductor transition region, when the resistance has significantly decreased (the onset of superconductivity has ... independent of the temperature. Note: Although a significant part of HTS samples show this behavior especially materials of lower quality, the bulk regime is often missin...

Ngày tải lên: 10/08/2014, 19:20

... significant parts of these devices are generally noisier. The reason of the higher noise level of the all types (dc and RF) of high- T c SQUIDs may be discrete or a large ensemble of Josephson ... predictions of the theory of the model of an ensemble of independent fluctuators. Far from T c (see the curve for T ϭ 8 K), the values of S ⌽ (␻) at frequency of 1 Hz are only...

Ngày tải lên: 10/08/2014, 19:20

... (125 133 ), aircraft parts (134 138 ), the quality of copper, alu- minum, and NbTi/Cu composite wire (139 ), stressed steel cylinders (140), and mapping of an embedded iron rod in a concrete block (131 ). ... even 10% of the wall thickness has also been detected success- fully by scanning the outside surface of the rim (138 ). A demonstration of capability of high- T c SQUID NDE...

Ngày tải lên: 10/08/2014, 19:20

... I c R n product of HTS junctions can also be expected to be larger than that of LTS junctions because it intrinsically depends on the gap voltage of the superconductor. A number of tests of the RSFQ ... Pd, and Pd/Au (30). Among of them, Pd/Au had a much smaller temperature coefficient and higher resistance, espe- cially at low -temperature, than Pd. The sheet resistance of 4...

Ngày tải lên: 10/08/2014, 19:20