Superconductivity at T_c ～ 9 K in the multiphase samples of a new quaternary system R-Rh-Si-B (R = Y, Lu, Er)

摘要

We have observed superconductivity in multiphase samples of the nominal composition YRh_4Si_2B, T_c ～ 9 K, and LuRh_4Si_2B, T_c ～ 8 K. We also observe a diamagnetic response in ErRh_4Si_2B. Our results suggest that a new quaternary phase is responsible for superconductivity in the system R-Rh-Si-B (R = Y, Lu, Er).