Investigation on the reported superconductivity in intercalated black phosphorus

Hanming Yuan, Liangzi Deng, Bing Lv, Zheng Wu, Ze Yang, Sheng Li, Shuyuan Huyan, Yizhou Ni, Jingying Sun, Fei Tian, Dezhi Wang, Hui Wang, Shuo Chen, Zhifeng Ren, Ching Wu Chu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Superconductivity intrinsic to the intercalated black phosphorus (BP) with a transition temperature Tc of 3.8 K, independent of the intercalant, whether an alkali or an alkaline earth element, has been reported recently by R. Zhang et al. (2017). However, the reported Tc and the field effect on the superconducting (SC) transition both bear great similarities to those for the pure Sn, which is commonly used for BP synthesis under the vapor transport method. We have therefore decided to determine whether a minute amount of Sn is present in the starting high purity BP crystals and whether it is the culprit for the small SC signal detected. Energy-dispersive X-ray spectroscopy results confirmed the existence of Sn in the starting high purity BP crystals purchased from the same company as in R. Zhang et al. (2017). We have reproduced the SC transition at 3.8 K in Li- and Na-intercalated BP crystals that contain minute amounts of Sn when prepared by the vapor transport method but not in BP crystals that are free of Sn when prepared by the high-pressure method. We have therefore concluded that the SC transition reported by R. Zhang et al. (2017) is associated with the Sn but not intrinsic to the intercalated BP crystals.

Original languageEnglish
Pages (from-to)7-11
Number of pages5
JournalMaterials Today Physics
Volume4
DOIs
Publication statusPublished - 2018 Mar

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Energy (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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