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<p>In this study, we investigated the relationship between excess conductivity and the local structure of Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+δ</sub> ((Bi, Pb)-2223) polycrystalline samples. A series of (Bi, Pb)-2223 + LSMO composites (0 – 1.5 wt%) were synthesized using the conventional solid-state reaction method. The critical temperature (<i>T</i><sub><i>c</i></sub>) determined from the temperature-dependent resistivity curves decreased with increasing LSMO content, from 106.65&#xa0;K for the pure sample to 102.48&#xa0;K to the 15 wt% sample, except for the 10 wt% sample, which exhibited a rise comparable to the pure sample. To elucidate the mechanisms affecting <i>T</i><sub><i>c</i></sub>, we applied the Aslamazov-Larkin (AL) and Lawrence-Doniach (LD) theories. We identified the Lawrence-Doniach temperature (<i>T</i><sub><i>LD</i></sub>) as the crossover point at which the system transitions from 2 to 3D fluctuations in the mean field region (MFR). Our calculations of excess conductivity within the MFR enabled us to quantify microscopic parameters such as the coherence length along the c-axis (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6956_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">\({\xi }_{c}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>ξ</mi> <mi>c</mi> </msub> </math></EquationSource> </InlineEquation>), interlayer coupling strength (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6956_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(J\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>J</mi> </math></EquationSource> </InlineEquation>), and interlayer coupling distance (<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_6956_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(d\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>d</mi> </math></EquationSource> </InlineEquation>), revealing trends in <i>T</i><sub><i>c</i></sub> associated with LSMO addition in the (Bi, Pb)-2223 system. The local atomic structure of the CuO<sub>2</sub> plane was characterized using X-ray absorption fine structure measurements at the Cu K-edge. We observed contrasting behaviors between the Cu–O and Cu-Ca bonds, indicating weakened interaction between the CuO<sub>2</sub> superconducting layer and the space layer. Meanwhile, the Cu-Sr bond exhibited suppression or elongation due to LSMO addition. Notably, in the 10 wt% sample, the bond lengths from the absorbing atom were similar to those in the pure sample, suggesting an inhomogeneous distribution of LSMO in the samples. These findings indicate that local structural alterations due to LSMO addition decrease the carrier supply to the CuO<sub>2</sub> layers, thereby affecting the superconducting properties of the (Bi, Pb)-2223 system.</p>

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Correlation Between Local Structure and Interlayer Coupling Through Fluctuations-Induced Conductivity in La0.7Sr0.3MnO3-Added (Bi, Pb)-2223 Superconductors

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Muhammad A. Anugrah,
  • Jun-Yung Oh,
  • Rico P. Putra,
  • Byeongwon Kang

摘要

In this study, we investigated the relationship between excess conductivity and the local structure of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ ((Bi, Pb)-2223) polycrystalline samples. A series of (Bi, Pb)-2223 + LSMO composites (0 – 1.5 wt%) were synthesized using the conventional solid-state reaction method. The critical temperature (Tc) determined from the temperature-dependent resistivity curves decreased with increasing LSMO content, from 106.65 K for the pure sample to 102.48 K to the 15 wt% sample, except for the 10 wt% sample, which exhibited a rise comparable to the pure sample. To elucidate the mechanisms affecting Tc, we applied the Aslamazov-Larkin (AL) and Lawrence-Doniach (LD) theories. We identified the Lawrence-Doniach temperature (TLD) as the crossover point at which the system transitions from 2 to 3D fluctuations in the mean field region (MFR). Our calculations of excess conductivity within the MFR enabled us to quantify microscopic parameters such as the coherence length along the c-axis ( \({\xi }_{c}\) ξ c ), interlayer coupling strength ( \(J\) J ), and interlayer coupling distance ( \(d\) d ), revealing trends in Tc associated with LSMO addition in the (Bi, Pb)-2223 system. The local atomic structure of the CuO2 plane was characterized using X-ray absorption fine structure measurements at the Cu K-edge. We observed contrasting behaviors between the Cu–O and Cu-Ca bonds, indicating weakened interaction between the CuO2 superconducting layer and the space layer. Meanwhile, the Cu-Sr bond exhibited suppression or elongation due to LSMO addition. Notably, in the 10 wt% sample, the bond lengths from the absorbing atom were similar to those in the pure sample, suggesting an inhomogeneous distribution of LSMO in the samples. These findings indicate that local structural alterations due to LSMO addition decrease the carrier supply to the CuO2 layers, thereby affecting the superconducting properties of the (Bi, Pb)-2223 system.