Weak Superconducting Anisotropy in 4 H b ‐Nb 0.95 Ti 0.05 Se 2 With 1 T /1 H Heterostructure

Abstract

ABSTRACT Heterostructures of layered transition metal dichalcogenide (TMD) exhibit rich physical properties by the combination of strong electronic correlation effects in 1 T layer and superconductivity in 1 H layer. But the limited number of bulk TMD materials with such heterostructures impedes the in‐depth understanding of the physical mechanisms behind these properties, as well as research on tuning of these properties. Here, we report a systematic study on the physical properties of the 4 H b ‐Nb 0.95 Ti 0.05 Se 2 single crystals with 1 T /1 H heterostructure. It exhibits a superconducting transition at a temperature below 3.3 K. Further analysis indicates that 4 H b ‐Nb 0.95 Ti 0.05 Se 2 is an intermediately coupled type‐II superconductor, and it may possess multiband nodeless superconductivity. Moreover, 4 H b ‐Nb 0.95 Ti 0.05 Se 2 shows a rather weak superconducting anisotropy (∼ 2), distinctly different from other known TMD superconductors with 4 H b heterostructure.