Исследуются сверхпроводниковые гетероструктуры с прослойкой из материала, в котором наблюдается сильное спин-орбитальное взаимодействие. В качестве материалов с сильным спин-орбитальным взаимодействием нами выбраны иридаты стронция, имеющие Ruddlesden−Popper-структуру (Sr n+1 IrnO 3n+1 ; n = 1, 2, ∞): парамагнитный металл SrIO 3 и магнитный изолятор Sr 2 IrO 4. С помощью лазерной абляции были получены эпитаксиальные пленки этих материалов, а также гетероструктуры на основе эпитаксиальных пленок купратного сверхпроводника YBa 2 Cu 3 Ox. Для электрофизических измерений изготавливались мезаструктуры микронных размеров с верхним электродом из бислоя Au/Nb. Работа выполнена при частичной поддержки программой Президиума РАН.
The technology of obtaining structured thin films of strontium iridates of the compositions SrIrO3 and Sr2IrO4 by direct current cathode sputtering is presented. Both compositions were synthesized using the stoichiometric target Sr2IrO4, only the technological parameters varied. The composition of the resulting films was determined by the operating pressure and temperature. The electrophysical and structural properties of the obtained dielectric Sr2IrO4 and "metallic" SrIrO3 films are discussed. The dielectric series is compared with Sr2IrO4 films obtained by laser ablation previously.
We report on results of experimental study of mesa heterostructures Nb/Au/Sr2IrO4/YBa2Cu3Ox with the barrier layer of Sr2IrO4, a material known as Mott antiferromagnetic insulator with high spin-orbit interaction energy, ESO ~ 0.4 eV. Under the influence of magnetic field H<15 Oe the resonant steps were registered at voltages Vn 1/L, inversely proportional to the width of the structures L. In contrast to the equidistant Fiske steps, changing the polarity of biasing current I, an asymmetry in Vn has been observed with a difference of voltage spacing between the steps. A change of applied magnetic field H has no effect of the voltages positions Vn , but the amplitudes of steps oscillate. Under microwave irradiation the Shapiro steps were observed demonstrating an oscillating behavior with power of applied microwaves.
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