<p>We have grown large (8–10 mm in dimension) single crystals of K<InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq7.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">$_{0.8}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow> <mn>0.8</mn> </mrow> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>Fe<InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq8.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">$_{1.7}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow> <mn>1.7</mn> </mrow> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>(Se<InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq9.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="23" /> </InlineMediaObject> <EquationSource Format="TEX">$_{0.73}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow> <mn>0.73</mn> </mrow> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>S<InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq10.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="23" /> </InlineMediaObject> <EquationSource Format="TEX">$_{0.27}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow> <mn>0.27</mn> </mrow> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>)<InlineEquation ID="IEq11"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq11.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">$_2$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>2</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation> composition with partial isovalent (Se,S) substitution related to the 122-Se family of iron-chalcogenide superconductors. High quality and homogeneity of the superconducting properties below <InlineEquation ID="IEq12"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq12.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="56" /> </InlineMediaObject> <EquationSource Format="TEX">$T_c \approx 26$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>T</mi> <mi>c</mi> </msub> <mo>≈</mo> <mn>26</mn> </mrow> </math></EquationSource> </InlineEquation> K were confirmed using X-ray diffraction, electron microscopy, energy dispersive X-ray spectroscopy, transport, and magnetic probes. Using detailed magnetotransport R(T) probes in magnetic fields up to 16 T in two field orientations (in-plane <InlineEquation ID="IEq13"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq13.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="54" /> </InlineMediaObject> <EquationSource Format="TEX">$H \parallel ab$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>H</mi> <mo stretchy="false">‖</mo> <mi>a</mi> <mi>b</mi> </mrow> </math></EquationSource> </InlineEquation> and out-of-plane <InlineEquation ID="IEq14"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq14.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="44" /> </InlineMediaObject> <EquationSource Format="TEX">$H \parallel c$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>H</mi> <mo stretchy="false">‖</mo> <mi>c</mi> </mrow> </math></EquationSource> </InlineEquation>), we determined temperature dependences of the upper critical field <InlineEquation ID="IEq15"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq15.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="71" /> </InlineMediaObject> <EquationSource Format="TEX">$\mu _0H_{c2}^{ab}(T)$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>μ</mi> <mn>0</mn> </msub> <msubsup> <mi>H</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> <mrow> <mi mathvariant="italic">ab</mi> </mrow> </msubsup> <mrow> <mo stretchy="false">(</mo> <mi>T</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq16"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq16.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="69" /> </InlineMediaObject> <EquationSource Format="TEX">$\mu _0H_{c2}^c(T)$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>μ</mi> <mn>0</mn> </msub> <msubsup> <mi>H</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> <mi>c</mi> </msubsup> <mrow> <mo stretchy="false">(</mo> <mi>T</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>, magnetic anisotropy <InlineEquation ID="IEq17"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq17.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="56" /> </InlineMediaObject> <EquationSource Format="TEX">$\gamma \approx 3.5$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>γ</mi> <mo>≈</mo> <mn>3.5</mn> </mrow> </math></EquationSource> </InlineEquation> in the vicinity of <InlineEquation ID="IEq18"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq18.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="TEX">$T_c$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mi>c</mi> </msub> </math></EquationSource> </InlineEquation>, and estimate zero-temperature values <InlineEquation ID="IEq19"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq19.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="105" /> </InlineMediaObject> <EquationSource Format="TEX">$\mu _0H_{c2}^{ab}(0) \approx 99$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>μ</mi> <mn>0</mn> </msub> <msubsup> <mi>H</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> <mrow> <mi mathvariant="italic">ab</mi> </mrow> </msubsup> <mrow> <mo stretchy="false">(</mo> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> <mo>≈</mo> <mn>99</mn> </mrow> </math></EquationSource> </InlineEquation> T, <InlineEquation ID="IEq20"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6963_Article_IEq20.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="103" /> </InlineMediaObject> <EquationSource Format="TEX">$\mu _0H_{c2}^c(0) \approx 28$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>μ</mi> <mn>0</mn> </msub> <msubsup> <mi>H</mi> <mrow> <mi>c</mi> <mn>2</mn> </mrow> <mi>c</mi> </msubsup> <mrow> <mo stretchy="false">(</mo> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> <mo>≈</mo> <mn>28</mn> </mrow> </math></EquationSource> </InlineEquation> T.</p>

Single Crystal Growth, Transport Phenomena, and Upper Critical Field of Alkali Metal-Based K$_x$Fe$_{2-y}$(Se,S)$_2$ Iron Chalcogenides

期刊论文
发表日期：

2025年4月1日

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Tatiana Kuzmicheva,
Leonid Morgun,
Sergey Gavrilkin,
Svetoslav Kuzmichev,
Alena Degtyarenko,
Andrei Muratov,
Ilya Zhuvagin,
Andrey Shilov,
Yevgeny Rakhmanov,
Igor Morozov

摘要

We have grown large (8–10 mm in dimension) single crystals of K $_{0.8}$ $_{0.8}$ Fe $_{1.7}$ $_{1.7}$ (Se $_{0.73}$ $_{0.73}$ S $_{0.27}$ $_{0.27}$ ) $_2$ $_{2}$ composition with partial isovalent (Se,S) substitution related to the 122-Se family of iron-chalcogenide superconductors. High quality and homogeneity of the superconducting properties below $T_c \approx 26$ $T_{c} \approx 26$ K were confirmed using X-ray diffraction, electron microscopy, energy dispersive X-ray spectroscopy, transport, and magnetic probes. Using detailed magnetotransport R(T) probes in magnetic fields up to 16 T in two field orientations (in-plane $H \parallel ab$ $H ‖ a b$ and out-of-plane $H \parallel c$ $H ‖ c$ ), we determined temperature dependences of the upper critical field $\mu _0H_{c2}^{ab}(T)$ $μ_{0} H_{c 2}^{ab} (T)$ and $\mu _0H_{c2}^c(T)$ $μ_{0} H_{c 2}^{c} (T)$ , magnetic anisotropy $\gamma \approx 3.5$ $γ \approx 3.5$ in the vicinity of $T_c$ $T_{c}$ , and estimate zero-temperature values $\mu _0H_{c2}^{ab}(0) \approx 99$ $μ_{0} H_{c 2}^{ab} (0) \approx 99$ T, $\mu _0H_{c2}^c(0) \approx 28$ $μ_{0} H_{c 2}^{c} (0) \approx 28$ T.

Single Crystal Growth, Transport Phenomena, and Upper Critical Field of Alkali Metal-Based K\(_x\)Fe\(_{2-y}\)(Se,S)\(_2\) Iron Chalcogenides

摘要