论文标题
拓扑超导体候选ti_（3）SB的超导特性和间隙结构
Superconducting properties and gap structure of the topological superconductor candidate Ti_(3)Sb
论文作者
论文摘要
我们介绍了候选拓扑超导体TI_（3）SB的超导特性的研究。电运输测量结果显示，〜5.9 k的T_（C，发病）的零电阻为偏移宽度ΔT_C〜0.6K。从磁通磁管传输和磁化率测量得出的超导相边界符合。我们估计一个临界场BC2（0）〜4.5 T. Ginzburg-landau（GL）分析得出的相干长度和ζ= 6.2 nm和λ= 340 nm的相干长度和渗透深度的值，以及GL参数〜55，表明极端的II型行为。此外，我们观察到特定热量（ΔC_E）/（γt_c）〜1.61的阶跃高度，该值大于Bardeen-Cooper-Schrieffer（BCS）值为1.43的值，表明适度耦合。通过隧道 - 二极管振荡器（TDO）技术对伦敦穿透深度的温度依赖性测量至〜450 MK显示出完整的超导间隙，与常规的S波间隙结构一致。
We present a study of the superconducting properties of the candidate topological superconductor Ti_(3)Sb. Electrical transport measurements show zero resistance with a T_(c,onset) of ~ 5.9 K with a transition width ΔT_c~ 0.6 K. The superconducting phase boundaries as derived from magneto-transport and magnetic susceptibility measurements agree well. We estimate an upper critical field Bc2(0)~4.5 T. A Ginzburg-Landau (GL) analysis yields values of the coherence length and penetration depth of ζ = 6.2 nm and λ = 340 nm, respectively, and a GL parameter ~ 55, indicating extreme type-II behavior. Furthermore, we observed a step height in the specific heat (ΔC_e)/(γT_c )~1.61, a value larger than the Bardeen-Cooper-Schrieffer (BCS) value of 1.43, suggesting modest coupling. Measurements of the temperature dependence of the London penetration depth via the tunnel-diode oscillator (TDO) technique down to ~ 450 mK show a full superconducting gap, consistent with a conventional s-wave gap structure.
