Study of microwave power absorption in yttrium-barium-copper based high-temperature superconductors and allied compounds
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Microwave absorption has been used to study the electromagnetic properties of the yttrium-barium-copper-oxide superconductor and other compounds in this phase system. The method can discriminate between superconductivity and metal-insulator and ferroelectric transitions in milligram size samples of powder. The transition that has been reported to occur near 240 K in several physical properties of samples of the high-temperature superconductor YBa 2Cu3O7 is shown to be not an intrinsic property of this material but to be associated with impurity phases or interfaces.
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Superconductor Science and Technology