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首页> 外文期刊>Physical review >Nodal superconductivity in isovalently substituted SrFe_2(As_(1-x)P_x)_2 pnictide superconductor at the optimal doping x = 0.35
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Nodal superconductivity in isovalently substituted SrFe_2(As_(1-x)P_x)_2 pnictide superconductor at the optimal doping x = 0.35

机译:最佳掺杂x = 0.35时,等价取代的SrFe_2(As_(1-x)P_x)_2肽超导体中的节点超导性

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摘要

Temperature-dependent London penetration depth λ(T) was measured in optimally doped x = 0.35, as-grown [T_c ≈ 25 K, RRR = ρ(300 K)/ρ(T_c) = 4.5], and annealed (T_c ≈ 35 K, RRR = 6.4) single crystals of SrFe_2(As_(1-x)P_x)_2 iron-based superconductor. Annealing increases the residual resistivity ratio (RRR) and decreases the absolute value of the London penetration depth from λ(0) = 300 ± 10 nm in the as-grown sample to λ(0) = 275 ± 10 nm. At low temperatures, λ(T) ~ T indicating a superconducting gap with line nodes. Analysis of the full-temperature range superfluid density is consistent with the line nodes, but differs from the simple single-gap d wave. The observed behavior is very similar to that of BaFe_2(As_(1-x)P_x)_2, showing that isovalently substituted pnictides are inherently different from the charge-doped materials.
机译:在最佳掺杂的x = 0.35中测量了与温度有关的伦敦穿透深度λ(T),生长时[T_c≈25 K,RRR =ρ(300 K)/ρ(T_c)= 4.5],然后退火(T_c≈35 SrFe_2(As_(1-x)P_x)_2铁基超导体的K,RR = 6.4)单晶。退火会增加残余电阻率(RRR),并使伦敦穿透深度的绝对值从刚生长的样品中的λ(0)= 300±10 nm减小到λ(0)= 275±10 nm。在低温下,λ(T)〜T表示具有线节点的超导间隙。全温度范围内超流体密度的分析与线节点一致,但不同于简单的单间隙d波。观察到的行为与BaFe_2(As_(1-x)P_x)_2的行为非常相似,表明等价取代的肽本质上不同于掺杂电荷的材料。

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  • 来源
    《Physical review》 |2013年第14期|140505.1-140505.5|共5页
  • 作者单位

    The Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    The Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    The Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    The Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green St., Urbana, Illinois 61801;

    Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green St., Urbana, Illinois 61801;

    Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan;

    Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan,JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo 102-0075, Japan;

    Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan,JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo 102-0075, Japan;

    The Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    pairing symmetries (other than s-wave); effects of crystal defects; doping and substitution;

    机译:配对对称性(s波除外);晶体缺陷的影响;掺杂和替代;

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