for fault-tolerant quantum computation. [1][2][3][4] Generally, there are two routes to realize topological superconductivity. One scheme is to build artificial topological superconductors based on hybrid structures, for example, utilizing the proximity effect between an s-wave superconductor and a spin-nondegenerate metal. [5][6][7][8] The other scheme is to find intrinsic topological superconductors with spin-triplet odd-parity pairing. However, such a superconducting state has been very rare in nature with only very limited possible candidates. [9] A possible way to obtain intrinsic topological superconductors is to dope carriers into a topological insulator or topological semimetal. [10][11][12] Although there have been some instructive attempts in doped topological insulators, [13][14][15][16] the synthesis of superconducting samples with a particular doping level is difficult. [17] Furthermore, it is not easy to preserve the bulk band structures of the topological insulator after doping and to ensure the emergence of unconventional superconductivity prevailing over the conventional one. [16] On the other hand, some encouraging experiments have shown proximity-induced superconductivity on the surface of 3D topological insulators, [18,19] whereas their topological nature is yet to be confirmed. Recently, superconductivity has been observed at the point contacts formed between normal metal tips and some non-superconducting topological semimetals. [20][21][22][23] Most recently, tip-induced superconductivity was observed on tungsten carbide (WC), which is a new type of topological semimetal with super hardness. [24] Though the underline mechanism including local pressure, confinement effect and some kind of interface coupling between tip and sample was still not confirmed, yet these findings suggest a new way to explore topological superconductivity in a heterostructure based on two completely non-superconducting metals.In this work, we show that the interfacial superconductivity possesses ubiquitously on the interface between WC single crystals and various metallic thin films. We deposited various metallic thin films on WC single crystals and performed conductance measurements on the films using soft point-contact technique. Andreev reflection signal was observed in the point-contact spectra for both nonmagnetic Au and Pt films and ferromagnetic Fe, Co, Ni films, supporting the existence of interfacial superconductivity. The compatibility of Interfaces between materials with different electronic ground states have become powerful platforms for creating and controlling novel quantum states of matter, in which inversion symmetry breaking and other effects at the interface may introduce additional electronic states. Among the emergent phenomena, superconductivity is of particular interest. Here, by depositing metal films on a newly identified topological semimetal tungsten carbide (WC) single crystal, interfacial superconductivity is obtained, evidenced from soft point-contact spectroscopy. This very robust pheno...

A new ‘seeding’ approach for the intercalation of protonated 1,10-phenanthroline into layered NiPS3 by using dopants as reaction active sites is proposed.

No abstract