Title
Electromagnetic Absorption In The Copper Oxide Superconductors (Selected Topics In Superconductivity),Used
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In 1987 a major breakthrough occurred in materials science. A new family of materials was discovered that became superconducting above the temperature at which nitrogen gas liquifies, namely, 77 K or 196C. Within months of the discovery, a wide variety of experimental techniques were brought to bear in order to measure the properties of these materials and to gain an understanding of why they superconduct at such high temperatures. Among the techniques used were electromagnetic absorption in both the normal and the superconducting states. The measurements enabled the determination of a wide variety of properties, and in some instances led to the observation of new effects not seen by other measu ments, such as the existence of weaklink microwave absorption at low dc magnetic fields. The number of different properties and the degree of detail that can be obtained from magnetic field and temperaturedependent studies of electromagnetic abso tion are not widely appreciated. For example, these measurements can provide information on the band gap, critical fields, the HT irreversibility line, the amount of trapped flux, and even information about the symmetry of the wave function of the Cooper pairs. It is possible to use low dc magnetic fieldinduced absorption of microwaves with derivative detection to verify the presence of superconductivity in a matter of minutes, and the measurements are often more straightforward than others. For example, they do not require the physical contact with the sample that is necessary when using fourprobe resistivity to detect superconductivity.
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