High-Temperature Superconducting Materials Science and by Donglu Shi

By Donglu Shi

This e-book explores the attention-grabbing box of high-temperature superconductivity. simple concepts-including experimental suggestions and theoretical issues-are mentioned in a transparent, systematic demeanour. moreover, the newest study ends up in the measurements, fabrics synthesis and processing, and characterization of actual homes of high-temperature superconductors are provided. Researchers and scholars alike can use this ebook as a finished advent not just to superconductivity but in addition to materials-related examine in electromagnetic ceramics.

Special positive factors of the book:

  • presents contemporary advancements in vortex-state houses, defects characterization, and section equilibrium
  • introduces uncomplicated ideas for experimental strategies at low temperatures and excessive magnetic fields
  • provides a worthwhile reference for materials-related research
  • discusses strength business functions of high-temperature superconductivity
  • includes novel processing applied sciences for skinny movie and bulk materials¬†
  • suggests components of study and particular difficulties whose resolution could make high-Tc superconductors a realistic reality

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Additional resources for High-Temperature Superconducting Materials Science and Engineering. New Concepts and Technology

Sample text

Both in-phase and out-of-phase components of the response were detected by the lock-in amplifier. 8. The susceptometer was located within a variable gas flow cryostat (as described earlier in this chapter), with changes in the temperature of the flowing vapor being followed by the temperature of the sample. Measurements were made by monitoring the sample behavior as the magnetometer was cooled from the normal state through any features in the response. For fixed values of the dc field, ac drive amplitude, and ac drive frequency, the temperature controller for the helium vapor was programmed to reduce slowly the output to the vaporizer in order to give a uniform cooling rate.

Following exposure, the sample is immersed in a chemical developer, which removes the photoresist from regions where it was exposed to light (for positive resist) or from areas where it was not exposed to light (for negative resist), leaving photoresist on the sample displaying the design of the mask. The sample may then be baked again to fully harden the resist, after which it is ready for etching to define the device structure in the sample material. The regions where the photoresist remains are protected from the etch.

Thus, they are suitable as control thermometers at high fields when there may be appreciable magnetoresistance in the setpoint thermometer. Platinum resistance thermometer (PRT): The resistance is measured by using a four-terminal configuration. It decreases monotonically with decreasing temperature. These thermometers have poor sensitivity below about 40 K, but above this region their magnetic field dependence is low. J. D. Hettinger and D. G. 4 M a g n e t i c Fields Several different types of magnet may be used to produce laboratory magnetic fields for low-temperature measurements on high-To superconductors.

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