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Investigations of the superconducting states of noncentrosymmetric LaPdSi_3 and LaPtSi_3

机译：非中心对称LaPdSi_3和LaPtSi_3的超导态研究

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摘要

The noncentrosymmetric superconductors LaPdSi_3 and LaPtSi_3 have been studied with magnetization, specific-heat, resistivity, and μSR measurements. These crystallize in the tetragonal BaNiSn_3 structure and superconductivity is observed at T_c = 2.65(5) K for LaPdSi_3 and T_c = 1.52(6) K for LaPtSi_3. The results are consistent with both compounds being weakly coupled, fully gapped superconductors but μSR measurements reveal that LaPdSi_3 is a bulk type-Ⅰ superconductor while LaPtSi_3 is a type-Ⅱ material with a Ginzburg-Landau parameter of k = 2.49(4). This is further supported by specific-heat measurements, where the transition in an applied field is first order in LaPdSi_3 but second order in LaPtSi_3. The electronic specific heat in the superconducting state was analyzed using an isotropic s-wave model that gave Δ_0/k_BT_c = 1.757(4) for LaPdSi_3 and 1.735(5) for LaPtSi_3. The temperature dependence of the effective penetration depth [λ_(eff)(T)] of LaPtSi_3 was extracted from μSR measurements and was fitted giving Δ_0/k_BT_c = 1.60(8) and λ_(eff)(0) = 239(3) nm. A critical field of S_c(0) = 182.7 G was obtained for LaPdSi_3 from μSR measurements, which is in good agreement with the calculated thermodynamic critical field.
机译：研究了非中心对称超导体LaPdSi_3和LaPtSi_3的磁化，比热，电阻率和μSR测量。它们在四方BaNiSn_3结构中结晶，对于LaPdSi_3，T_c = 2.65（5）K，对于LaPtSi_3，T_c = 1.52（6）K，观察到超导。结果与两种化合物均具有弱耦合，完全间隙的超导体是一致的，但μSR测量表明LaPdSi_3是块状Ⅰ型超导体，而LaPtSi_3是Ⅱ型材料，其Ginzburg-Landau参数k = 2.49（4）。比热测量进一步支持了这一点，在外加场中，转变在LaPdSi_3中为一阶，而在LaPtSi_3中为二阶。使用各向同性s波模型分析超导状态下的电子比热，该模型对于LaPdSi_3给出了Δ_0/ k_BT_c = 1.757（4），对于LaPtSi_3给出了1.735（5）。从μSR测量中提取了LaPtSi_3的有效穿透深度[λ_（eff）（T）]的温度依赖性，并将其拟合为Δ_0/ k_BT_c = 1.60（8）和λ_（eff）（0）= 239（3）nm 。 LaPdSi_3的μSR测量获得了S_c（0）= 182.7 G的临界场，与计算出的热力学临界场非常吻合。

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  • 来源
    《Physical review》 |2014年第9期|094509.1-094509.10|共10页
  • 作者

    M. Smidman; A. D. Hillier; D. T. Adroja; M. R. Lees; V. K. Anand; R. P. Singh; R. I. Smith; D. M. Paul; G. Balakrishnan;

  • 作者单位

    Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom;

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom;

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom,Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa;

    Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom;

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom;

    Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom;

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom;

    Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom;

    Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom;

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    muon spin rotation and relaxation; thermodynamic properties; magnetic properties; metals; alloys and binary compounds (including A15, MgB2, etc.);

    机译：介子旋转和松弛;热力学性质;磁性金属;合金和二元化合物（包括A15;MgB2等）;

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