摘要: Our investigations of CeNi_4B, while pursuing new valence fluctuation materials, motivated us to study YNi_4B as a reference material which led us to the discovery of weak signals of superconductivity in YNi_4B and bulk supercondu... 展开 Our investigations of CeNi_4B, while pursuing new valence fluctuation materials, motivated us to study YNi_4B as a reference material which led us to the discovery of weak signals of superconductivity in YNi_4B and bulk superconductivity in multi- phase samples of the quaternary borocarbide system Y-Ni-B-C. As future directions in magnetic superconducting borocarbides, I emphasize the necessity of synthesizing new quaternaries and, possibly, multinaries. I, then, suggest several new experiments on interplay of superconductivity and magnetism in borocarbides. If carried out successfully, results of these experiments should be of crucial importance with respect to phenomenology of superconductivity. 收起