<p><InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\hbox {FeSe}_{\mathrm{1-x}} \hbox {S}_{\textrm{x}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>FeSe</mtext> <mrow> <mn>1</mn> <mo>-</mo> <mi mathvariant="normal">x</mi> </mrow> </msub> <msub> <mtext>S</mtext> <mtext>x</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation> is known to have a characteristic phase diagram where superconducting (SC), nematic and antiferromagnetic (AFM) phases coexist or compete to each other. We report single crystal growth of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\hbox {FeSe}_{\mathrm{1-x}} \hbox {S}_{\textrm{x}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>FeSe</mtext> <mrow> <mn>1</mn> <mo>-</mo> <mi mathvariant="normal">x</mi> </mrow> </msub> <msub> <mtext>S</mtext> <mtext>x</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation> and pressure effect on superconductivity for the specimens with <i>x</i>=0.02 through the measurements of DC magnetization (<i>M</i>) and electrical resistivity (<InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\rho\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ρ</mi> </math></EquationSource> </InlineEquation>) as a function of temperature (<i>T</i>). Single crystals of <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\hbox {FeSe}_{\mathrm{1-x}} \hbox {S}_{\textrm{x}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>FeSe</mtext> <mrow> <mn>1</mn> <mo>-</mo> <mi mathvariant="normal">x</mi> </mrow> </msub> <msub> <mtext>S</mtext> <mtext>x</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation> (<InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(x\le 0.17\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>x</mi> <mo>≤</mo> <mn>0.17</mn> </mrow> </math></EquationSource> </InlineEquation>) with a maximum dimension of 1.5<InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\times\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>×</mo> </math></EquationSource> </InlineEquation>1.5 <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\hbox {mm}^2\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mtext>mm</mtext> <mn>2</mn> </msup> </math></EquationSource> </InlineEquation> were successfully obtained by a chemical vapor transport method. The <i>M</i>(<i>T</i>) and <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(\rho\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ρ</mi> </math></EquationSource> </InlineEquation>(<i>T</i>) measurements have revealed that a nematic phase is suppressed and disappears at <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(\sim\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>∼</mo> </math></EquationSource> </InlineEquation>1.5 GPa, where superconducting transition temperature <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(T_{\textrm{c}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mtext>c</mtext> </msub> </math></EquationSource> </InlineEquation> shows a local minimum, while AFM phases appear separately inside and outside the nematic phase. A crossover of superconductivity near the end point of AFM phase reported in our previous study for <InlineEquation ID="IEq13"> <EquationSource Format="TEX">\(x\ge 0.04\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>x</mi> <mo>≥</mo> <mn>0.04</mn> </mrow> </math></EquationSource> </InlineEquation> was not observed for <i>x</i>=0.02.</p>

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Single Crystal Growth and Pressure Effect on Superconductivity of \(\hbox {FeSe}_{\mathrm{1-x}} \hbox {S}_{\textrm{x}}\)

  • Kiyotaka Miyoshi,
  • Yumi Yamamoto,
  • Takanobu Nakatani,
  • Daichi Izuhara,
  • Ikumi Matsushima

摘要

\(\hbox {FeSe}_{\mathrm{1-x}} \hbox {S}_{\textrm{x}}\) FeSe 1 - x S x is known to have a characteristic phase diagram where superconducting (SC), nematic and antiferromagnetic (AFM) phases coexist or compete to each other. We report single crystal growth of \(\hbox {FeSe}_{\mathrm{1-x}} \hbox {S}_{\textrm{x}}\) FeSe 1 - x S x and pressure effect on superconductivity for the specimens with x=0.02 through the measurements of DC magnetization (M) and electrical resistivity ( \(\rho\) ρ ) as a function of temperature (T). Single crystals of \(\hbox {FeSe}_{\mathrm{1-x}} \hbox {S}_{\textrm{x}}\) FeSe 1 - x S x ( \(x\le 0.17\) x 0.17 ) with a maximum dimension of 1.5 \(\times\) × 1.5 \(\hbox {mm}^2\) mm 2 were successfully obtained by a chemical vapor transport method. The M(T) and \(\rho\) ρ (T) measurements have revealed that a nematic phase is suppressed and disappears at \(\sim\) 1.5 GPa, where superconducting transition temperature \(T_{\textrm{c}}\) T c shows a local minimum, while AFM phases appear separately inside and outside the nematic phase. A crossover of superconductivity near the end point of AFM phase reported in our previous study for \(x\ge 0.04\) x 0.04 was not observed for x=0.02.