We report our experimental observation of interlayer exchange coupling phenomena in CoO∕Cu∕Co trilayers with systematic variation of Cu spacer layer thickness as well as temperature. It has been found that there exists a clear indication of nonmonotonically varying oscillatory interlayer exchange coupling. The amplitude of oscillation increases, reaches to the maximum, and decreases with increasing Cu spacer thickness from 1 to 16 atomic layers for all temperature ranges between 70 and 200K.
Anomalous Behavior of the Superconducting Transition Temperature and Width in the Tl-Ba-Ca-Cu-O System in Dependence on the Metal Oxides Concentration. -Thallium containing cuprate ceramics of the general composition TlBa 2 Ca 2 Cu 3 O 9 alloyed with different amounts of metal oxides (MgO, Ta 2 O 5 , HfO 2 , V 2 O 5 , as well as MgO/BaF 2 ) are synthesized. The presence of BaF 2 allows the introduction of metal oxide without significant changes of the superconducting properties. Width and transition temp. vary in dependence on the concentration of the metal oxide. -(VOLKOV, V. E.; DANILOV, J. YU.; ZHAROVA, L. A.; KOVALEV, YU. G.; ZHIDKOV, L. L.; CHERNOV, V. K.; MATORIN, E. E.; BUZMAKOV, A. E.; VAKHTEL', A. K.; Zh.
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