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Superconductivity in noncentrosymmetric YPtBi under pressure

机译:非中心对称YPtBi在压力下的超导

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We report a high-pressure single-crystal study of the noncentrosymmetric superconductor YPtBi (T_c = 0.77 K). Magnetotransport measurements show a weak metallic behavior with a carrier concentration n ≌ 2.2 × 10~(19) cm~(-3). Resistivity measurements up to p = 2.51 GPa reveal superconductivity is promoted by pressure. The reduced upper critical field B_(C2)(T) curves collapse onto a single curve, with values that exceed the model values for spin-singlet superconductivity. The B_(C2) data point to an odd-parity component in the superconducting order parameter, in accordance with predictions for noncentrosymmetric superconductors.
机译:我们报告了非中心对称超导体YPtBi(T_c = 0.77 K)的高压单晶研究。磁传输测量显示出较弱的金属行为,载流子浓度为n≌2.2×10〜(19)cm〜(-3)。高达p = 2.51 GPa的电阻率测量结果表明,压力可促进超导性。减小的上临界场B_(C2)(T)曲线折叠为一条曲线,其值超过自旋单极超导性的模型值。根据对非中心对称超导体的预测,B_(C2)数据指向超导阶跃参数中的奇偶校验分量。

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