Resistivity, magnetoresistance, and upper critical field, have been comprehensively studied for the bismuth (Bi)-III superconducting phase in the pressure range of 2.9 GPa ⩽ P⩽ 6.2 GPa. It is discovered that the transition temperature T _c of the Bi-III phase is gradually suppressed with increasing pressure. Strikingly, the temperature-dependent resistivity above T _c in the Bi-III region reveals notable non-Fermi-liquid behaviors, resembling many unconventional superconducting systems. As the pressure increases, the magnetoresistance effect progressively grows and reaches a maximum value of 212% at pressure ∼6.2 GPa and field of 5 T, indicating a possible contribution to the charge conduction by Dirac electrons. Moreover, the zero-temperature upper critical field for the Bi-III phase displays relatively low values concerning the moderate T _c values, and the reduced upper critical field for different pressures deviates from the single-band Werthamer–Helfand–Hohenberg model. These unusual normal state transport properties and unique behavior of the upper critical field point to possible unconventional superconductivity for the Bi-III superconducting phase.

已经对铋 (Bi)-III 超导相在 2.9 GPa ⩽ P ⩽ 6.2 GPa压力范围内的电阻率、磁阻和上临界场进行了综合研究。发现随着压力的增加，Bi-III相的转变温度T _c逐渐被抑制。引人注目的是，高于T _c的温度相关电阻率在 Bi-III 区域显示出显着的非费米液体行为，类似于许多非常规超导系统。随着压力的增加，磁阻效应逐渐增大，在压力~6.2 GPa 和场强为 5 T 时达到最大值 212%，表明 Dirac 电子对电荷传导的可能贡献。此外，Bi-III 相的零温度上临界场在中等T _c值方面显示出相对较低的值，并且不同压力下减小的上临界场偏离了单波段 Werthamer-Helfand-Hohenberg 模型。这些不寻常的常态传输特性和上临界场的独特行为表明 Bi-III 超导相可能具有非常规超导性。