Abstract—

We have studied the electrical-transport, thermophysical, and magnetic properties of the YRh₄B₄ and HoRh_3.8Ru_0.2B₄ compounds. YRh₄B₄ has been shown to be a classic type II superconductor with T_c ~ 10 K, whereas the superconducting transition of HoRh_3.8Ru_0.2B₄ (at T_c ~ 6 K) occurs along with its ferrimagnetic transition (T_m ~ 22–23 K). We have measured magnetic irreversibility loops for the YRh₄B₄ and HoRh_3.8Ru_0.2B₄ compounds and calculated J_c(B) in the Bean model. The reduced pinning force F_p/F_{p max} as a function of h_p = B/B_c2 for YRh₄B₄ has been shown to obey a “scaling” law, whereas the magnetic superconductor HoRh_3.8Ru_0.2B₄ exhibits a significant deviation from the scaling law for h_p > 0.2.

中文翻译：

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超导硼化铑YRh4B4和HoRh3.8Ru0.2B4的磁性和临界电流

摘要-

我们研究了 YRh ₄ B ₄和 HoRh _3.8 Ru _0.2 B ₄化合物的电传输、热物理和磁性能。YRh ₄ B ₄已被证明是T _c ~ 10 K的经典 II 型超导体，而 HoRh _3.8 Ru _0.2 B ₄（在T _c ~ 6 K）的超导跃迁与其亚铁磁跃迁（T _m ~ 22–23 K）。我们已经测量了 YRh ₄ B ₄和 HoRh 的磁不可逆回线_3.8 Ru _0.2 B ₄化合物和在Bean模型中计算的J _c (B)。YRh ₄ B ₄的减小的钉扎力F _p / F _{p max}作为h _p = B / B _c2的函数已被证明遵守“缩放”定律，而磁超导体 HoRh _3.8 Ru _0.2 B ₄表现出显着的h _p > 0.2 时与标度律的偏差。