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Chin-Sen Ting is a Chinese American physicist from Taiwan and an academic.He is a distinguished professor of physics at the University of Houston. [1]Through his research, Ting has explored condensed matter theories in semiconductors, magnetism, superconductivity, and correlated electron systems, focusing on solid state systems using methods like diagrammatic many body theory and Monte Carlo ...
For example, those used in the Gravity Probe B experiment measured changes in gyroscope spin axis orientation to better than 0.5 milliarcseconds (1.4 × 10 −7 degrees) over a one-year period. [2] This is equivalent to an angular separation the width of a human hair viewed from 32 kilometers (20 miles) away.
The table below shows some of the parameters of common superconductors. X:Y means material X doped with element Y, T C is the highest reported transition temperature in kelvins and H C is a critical magnetic field in tesla. "BCS" means whether or not the superconductivity is explained within the BCS theory.
Podkletnov's first peer-reviewed paper on the apparent gravity-modification effect, published in 1992, attracted little notice. [3] In 1996, he submitted a longer paper, in which he claimed to have observed a larger effect (2% weight reduction as opposed to 0.3% in the 1992 paper) to the Journal of Physics D.
Eugene Podkletnov, a Russian engineer, has claimed since the early 1990s to have made such a device consisting of a spinning superconductor producing a powerful "gravitomagnetic field." In 2006, a research group funded by ESA claimed to have created a similar device that demonstrated positive results for the production of gravitomagnetism ...
The nature of the superconducting state in ferromagnetic superconductors is currently under debate. Early investigations [5] studied the coexistence of conventional s-wave superconductivity with itinerant ferromagnetism. However, the scenario of spin-triplet pairing soon gained the upper hand.
For crossed Andreev reflection to occur, electrons of opposite spin must exist at each normal electrode (so as to form the pair in the superconductor). If the normal material is a ferromagnet this may be guaranteed by creating opposite spin polarization via the application of a magnetic field to normal electrodes of differing coercivity.
The field can be redefined to give a real scalar field (i.e., a spin-zero particle) θ without any constraint by ϕ = v e i θ {\displaystyle \phi =ve^{i\theta }} where θ is the Nambu–Goldstone boson (actually v θ {\displaystyle v\theta } is) and the U (1) symmetry transformation effects a shift on θ , namely