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首页> 外文期刊>Physical review >Superconductivity in rubidium-substituted Ba_(1-x)Rb_xTi_2Sb_2O
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Superconductivity in rubidium-substituted Ba_(1-x)Rb_xTi_2Sb_2O

机译：rub取代的Ba_（1-x）Rb_xTi_2Sb_2O中的超导

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摘要

We report on the synthesis and the physical properties of Ba_(1-x)Rb_xTi_2Sb_2O (x ≤ 0.4) by x-ray diffraction, superconducting quantum interference device magnetometry, resistivity, and specific-heat measurements. Upon hole doping by substituting Ba with Rb, we find superconductivity with a maximum T_c = 5.4 K. Simultaneously, the charge-density-wave transition temperature is strongly reduced from T_(CDW)≈55 K in the parent compound BaTi_2Sb_2O and seems to be suppressed for x ≥ 0.2. The bulk character of the superconducting state for the optimally doped sample (x = 0.2) is confirmed by the occurrence of a well developed discontinuity in the specific heat at T_c, with ΔC/T_C ≈ 22 mJ/mol K~2, as well as a large Meissner-shielding fraction of ≈40%. The isotropically averaged lower and upper critical fields of the optimally doped sample (x = 0.2) are estimated to μ_0H_(c,1)(0) ≈ 3.8 mT and μ_0H_(c,2)(0) ≈ 2.3 T, respectively, indicating that these compounds are strongly type-Ⅱ superconductors.
机译：我们通过x射线衍射，超导量子干涉仪磁法，电阻率和比热测量报告了Ba_（1-x）Rb_xTi_2Sb_2O（x≤0.4）的合成和物理性质。通过用Ba代替Ba进行空穴掺杂，我们发现最大T_c = 5.4 K的超导性。同时，母体化合物BaTi_2Sb_2O中的电荷密度波跃迁温度从T_（CDW）≈55K大大降低，似乎是抑制x≥0.2。最佳掺杂样品（x = 0.2）的超导状态的整体特征由T_c处比热的良好发展的不连续性确定，ΔC/ T_C≈22 mJ / mol K〜2，以及约40％的很大的Meissner屏蔽率。最佳掺杂样品（x = 0.2）的各向同性平均下临界场和上临界场分别估计为μ_0H_（c，1）（0）≈3.8 mT和μ_0H_（c，2）（0）≈2.3 T这些化合物是强Ⅱ型超导体。

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