Abstract
We report the discovery of superconductivity in the quasi-one-dimensional (Q-1D) SrBi2Se4 single crystals grown by the self-flux method. It is found that the resistivity displays a metallic behavior in the normal state, followed by a superconducting transition at low temperatures, distinctly different from the semiconducting behavior of the previously reported polycrystalline samples. Both magnetization and specific heat measurements reveal the bulk nature of superconductivity. The extrapolated value of upper critical field μ0Hc2(0) for H||c is ∼2.4 times larger than the Pauli limit. More intriguingly, the field dependence of resistivity at certain temperatures exhibits an anomalously hump-like feature for Hc; that is, the finite resistivity due to vortex motion in the dissipative state first increases with magnetic fields and then unexpectedly drops back to zero at higher fields, indicating the reentrant vortex pinning induced by increasing magnetic fields. The discovery of superconductivity in SrBi2Se4 single crystals thus provides a novel material platform to study the exotic superconductivity in the Q-1D electron systems.
| Original language | English |
|---|---|
| Pages (from-to) | 6752-6760 |
| Number of pages | 9 |
| Journal | Chemistry of Materials |
| Volume | 33 |
| Issue number | 17 |
| DOIs | |
| State | Published - Sep 14 2021 |
Funding
This work was partly supported by the National Natural Science Foundation of China (grant nos. U1932217 and 11674054), the National Key R&D Program of China (grant no. 2018YFA0704300), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (grant no. XDB25000000), the Fundamental Research Funds for the Central Universities, and the JSPS KAKENHI (grant no. JP19H00648). Y.F. Zhang was also supported by the China Scholarship Council (CSC).