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Abstract <p>The article presents the results of studies of the ultrafast photoinduced dynamics of the reflection coefficient of superconducting composites based on layered cuprates of the REBCO family (RE = Y) on a Hastelloy C-276 alloy substrate in the temperature range of 5–200 K. It is shown that the ultrafast responses of the reflection coefficient to excitation by femtosecond light pulses contain components determined by the normal and superconducting subsystems. The contribution from the normal component exhibits faster relaxation, ~0.2 ps, and its amplitude is proportional to the pump energy density over a wide range of values. For the response of the superconducting component observed below <i>T</i><sub>c</sub> = 92 K, a longer relaxation time is observed, ~2.5 ps, and the variation of the response amplitude with the pump energy density shows a kink at ~14 μJ/cm<sup>2</sup>. The amplitude of the superconducting-component response varies with temperature in accordance with the predictions of the Rothwarf–Taylor phenomenological model. According to ultrafast laser spectroscopy, thin-film composites based on YBa<sub>2</sub>Cu<sub>3</sub>O<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(_{{7 - x}}\)</EquationSource> <!--NuclPhys2509041MartirosyanI-m1--> </InlineEquation> have properties that are quite similar to those of these compounds in the form of single crystals.</p>

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Investigation of Nonequilibrium Photoexcited States in HTS Composites Using Ultrafast Laser Spectroscopy

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • I. V. Martirosyan,
  • S. V. Pokrovskii,
  • A. V. Petrov,
  • R. V. Yusupov

摘要

Abstract

The article presents the results of studies of the ultrafast photoinduced dynamics of the reflection coefficient of superconducting composites based on layered cuprates of the REBCO family (RE = Y) on a Hastelloy C-276 alloy substrate in the temperature range of 5–200 K. It is shown that the ultrafast responses of the reflection coefficient to excitation by femtosecond light pulses contain components determined by the normal and superconducting subsystems. The contribution from the normal component exhibits faster relaxation, ~0.2 ps, and its amplitude is proportional to the pump energy density over a wide range of values. For the response of the superconducting component observed below Tc = 92 K, a longer relaxation time is observed, ~2.5 ps, and the variation of the response amplitude with the pump energy density shows a kink at ~14 μJ/cm2. The amplitude of the superconducting-component response varies with temperature in accordance with the predictions of the Rothwarf–Taylor phenomenological model. According to ultrafast laser spectroscopy, thin-film composites based on YBa2Cu3O \(_{{7 - x}}\) have properties that are quite similar to those of these compounds in the form of single crystals.