Signature of coexistence of superconductivity and ferromagnetism in two-dimensional NbSe 2 triggered by surface molecular adsorption

Xiaojiao Zhu, Yuqiao Guo, Hao Cheng, Jun Dai, Xingda An, Jiyin Zhao, Kangzhen Tian, Shiqiang Wei, Xiao Cheng Zeng, Changzheng Wu, Yi Xie

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

Ferromagnetism is usually deemed incompatible with superconductivity. Consequently, the coexistence of superconductivity and ferromagnetism is usually observed only in elegantly designed multi-ingredient structures in which the two competing electronic states originate from separate structural components. Here we report the use of surface molecular adsorption to induce ferromagnetism in two-dimensional superconducting NbSe 2, representing the freestanding case of the coexistence of superconductivity and ferromagnetism in one two-dimensional nanomaterial. Surface-structural modulation of the ultrathin superconducting NbSe 2 by polar reductive hydrazine molecules triggers a slight elongation of the covalent Nb-Se bond, which weakens the covalent interaction and enhances the ionicity of the tetravalent Nb with unpaired electrons, yielding ferromagnetic ordering. The induced ferromagnetic momentum couples with conduction electrons generating unique correlated effects of intrinsic negative magnetoresistance and the Kondo effect. We anticipate that the surface molecular adsorption will be a powerful tool to regulate spin ordering in the two-dimensional paradigm.

Original languageEnglish (US)
Article number11210
JournalNature communications
Volume7
DOIs
StatePublished - Apr 4 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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