High Hole Mobility and Nonsaturating Giant Magnetoresistance in the New 2D Metal NaCu 4 Se 4 Synthesized by a Unique Pathway

Haijie Chen, Joao N.B. Rodrigues, Alexander J.E. Rettie, Tze Bin Song, Daniel G. Chica, Xianli Su, Jin Ke Bao, Duck Young Chung, Wai Kwong Kwok, Lucas K. Wagner, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The new compound NaCu 4 Se 4 forms by the reaction of CuO and Cu in a molten sodium polyselenide flux, with the existence of CuO being unexpectedly critical to its synthesis. It adopts a layered hexagonal structure (space group P6 3 /mmc with cell parameters a = 3.9931(6) Å and c = 25.167(5) Å), consisting of infinite two-dimensional [Cu 4 Se 4 ] - slabs separated by Na + cations. X-ray photoelectron spectroscopy suggests that NaCu 4 Se 4 is mixed-valent with the formula (Na + )(Cu + ) 4 (Se 2- )(Se - )(Se 2 ) 2- . NaCu 4 Se 4 is a p-type metal with a carrier density of â10 21 cm -3 and a high hole mobility of â808 cm 2 V -1 s -1 at 2 K based on electronic transport measurements. First-principles calculations suggest the density of states around the Fermi level are composed of Cu-d and Se-p orbitals. At 2 K, a very large transverse magnetoresistance of â1400% was observed, with a nonsaturating, linear dependence on field up to 9 T. Our results indicate that the use of metal oxide chemical precursors can open reaction paths to new low-dimensional compounds.

Original languageEnglish (US)
Pages (from-to)635-642
Number of pages8
JournalJournal of the American Chemical Society
Issue number1
StatePublished - Jan 9 2019

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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