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<p>Superconducting spin valve heterostructures of the F1/F2/S design, consisting of superconducting (S) and ferromagnetic (F) layers, have been studied in order to detect the theoretically predicted state of solitary superconductivity. This state is characterized by the occurrence of superconductivity only at the antiparallel magnetizations of the ferromagnetic layers. In this work, owing to optimally selected design parameters of the superconducting spin valve, the state of solitary superconductivity has been experimentally realized for the first time. An anomalously large spin valve effect <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Delta {{T}_{{\text{c}}}} = T_{{\text{c}}}^{{{\text{AP}}}} - T_{{\text{c}}}^{{\text{P}}} &gt; 0.2\)</EquationSource> <!--JETPLet2560959Arbuzov-m1--> </InlineEquation> K, which can reach a value of 1.6&#xa0;K in a magnetic field of 1 kOe, has been detected in an HA/HA/Pb superconducting spin valve (where HA is a Heusler alloy Co<sub>2</sub>Cr<sub>1 –</sub> <sub><i>x</i></sub>Fe<sub><i>x</i></sub>Al). Until now, comparable results in terms of the superconducting spin valve effect have been observed only in structures with triplet superconductivity in external magnetic fields significantly exceeding 1 kOe. The obtained results open new prospects for the development of superconducting current control devices.</p>

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Superconducting Spin Valve in the Solitary Superconductivity Regime

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月1日

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  • D. A. Arbuzov,
  • A. A. Kamashev,
  • N. N. Garif’yanov,
  • Yu. N. Proshin,
  • I. A. Garifullin

摘要

Superconducting spin valve heterostructures of the F1/F2/S design, consisting of superconducting (S) and ferromagnetic (F) layers, have been studied in order to detect the theoretically predicted state of solitary superconductivity. This state is characterized by the occurrence of superconductivity only at the antiparallel magnetizations of the ferromagnetic layers. In this work, owing to optimally selected design parameters of the superconducting spin valve, the state of solitary superconductivity has been experimentally realized for the first time. An anomalously large spin valve effect \(\Delta {{T}_{{\text{c}}}} = T_{{\text{c}}}^{{{\text{AP}}}} - T_{{\text{c}}}^{{\text{P}}} > 0.2\) K, which can reach a value of 1.6 K in a magnetic field of 1 kOe, has been detected in an HA/HA/Pb superconducting spin valve (where HA is a Heusler alloy Co2Cr1 – xFexAl). Until now, comparable results in terms of the superconducting spin valve effect have been observed only in structures with triplet superconductivity in external magnetic fields significantly exceeding 1 kOe. The obtained results open new prospects for the development of superconducting current control devices.