Scholarlink

<p>Using incoherent multiple Andreev reflection effect spectroscopy, we have studied the properties of the superconducting phase of (K,Na)<sub><i>x</i></sub>Fe<sub>2–<i>y</i></sub>Se<sub>2</sub> and K<sub><i>z</i></sub>Fe<sub>2 –</sub> <sub><i>y</i></sub>(Se,S)<sub>2</sub> iron selenides with critical temperatures <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4166_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="85" /> </InlineMediaObject> <EquationSource Format="TEX">\({{T}_{c}} \approx 27{-} 31\)</EquationSource> <!--JETPLet2560579Kuzmicheva-m1--> </InlineEquation> K. In both compositions, we directly show a presence of a single superconducting order parameter, and directly determine its magnitude and temperature dependence. The obtained characteristic ratio <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4166_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="163" /> </InlineMediaObject> <EquationSource Format="TEX">\(2\Delta (0){\text{/}}{{k}_{B}}{{T}_{c}} \approx 4.1{-} 4.6\)</EquationSource> <!--JETPLet2560579Kuzmicheva-m2--> </InlineEquation> results from a strong coupling in the electron bands. The similarity between the superconducting gap structure and the observed <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4166_Article_IEq3.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="35" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Delta (0)\)</EquationSource> <!--JETPLet2560579Kuzmicheva-m3--> </InlineEquation> scaling with critical temperature points to a uniform Cooper pairing mechanism in (K,Na)<sub><i>x</i></sub>Fe<sub>2–<i>y</i></sub>Se<sub>2</sub> and K<sub><i>z</i></sub>Fe<sub>2–<i>y</i></sub>(Se,S)<sub>2</sub> iron selenides.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Comparison of the Superconducting Properties of Potassium Iron Selenides with Isovalent Substitution

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月15日

查看全文
  • T. E. Kuzmicheva,
  • S. A. Kuzmichev,
  • A. D. Ilina,
  • I. A. Nikitchenkov,
  • Ye. O. Rakhmanov,
  • A. I. Shilov,
  • I. V. Morozov

摘要

Using incoherent multiple Andreev reflection effect spectroscopy, we have studied the properties of the superconducting phase of (K,Na)xFe2–ySe2 and KzFe2 – y(Se,S)2 iron selenides with critical temperatures \({{T}_{c}} \approx 27{-} 31\) K. In both compositions, we directly show a presence of a single superconducting order parameter, and directly determine its magnitude and temperature dependence. The obtained characteristic ratio \(2\Delta (0){\text{/}}{{k}_{B}}{{T}_{c}} \approx 4.1{-} 4.6\) results from a strong coupling in the electron bands. The similarity between the superconducting gap structure and the observed \(\Delta (0)\) scaling with critical temperature points to a uniform Cooper pairing mechanism in (K,Na)xFe2–ySe2 and KzFe2–y(Se,S)2 iron selenides.