Resolving the order parameter of high-Tc superconductors through quantum pumping spectroscopy
Colin Benjamin
DOI 10.1103/PhysRevB.71.174512 · Physical Review B
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Abstract
The order parameter of high-Tc superconductors through a series of experiments has been quite conclusively demonstrated to not be of the normal s-wave type. It is either a pure dx2−y2-wave type or a mixture of a dx2−y2-wave with a small imaginary s-wave or dxy-wave component. In this work a distinction is brought out among the four types (i.e., s-wave, dx2−y2-wave, dx2−y2+is-wave, and dx2−y2+idxy-wave types) with the help of quantum pumping spectroscopy. This involves a normal-metal double-barrier structure in contact with a high-Tc superconductor. The pumped current, heat, and noise show different characteristics with change in order parameter revealing quite easily the differences among these.
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