Chen, H;
Rodrigues, JNB;
Rettie, AJE;
Song, T-B;
Chica, DG;
Su, X;
Bao, J-K;
... Kanatzidis, MG; + view all
(2019)
High Hole Mobility and Nonsaturating Giant Magnetoresistance in the New 2D Metal NaCu4Se4 Synthesized by a Unique Pathway.
Journal of The American Chemical Society
, 141
(1)
pp. 635-642.
10.1021/jacs.8b11911.
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Abstract
The new compound NaCu4Se4 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 P63/mmc with cell parameters a = 3.9931(6) Å and c = 25.167(5) Å), consisting of infinite two-dimensional [Cu4Se4]− slabs separated by Na+ cations. X-ray photoelectron spectroscopy suggests that NaCu4Se4 is mixed-valent with the formula (Na+)(Cu+)4(Se2–)(Se–)(Se2)2–. NaCu4Se4 is a p-type metal with a carrier density of ∼1021 cm–3 and a high hole mobility of ∼808 cm2 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 ∼1400% 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.
| Type: | Article |
|---|---|
| Title: | High Hole Mobility and Nonsaturating Giant Magnetoresistance in the New 2D Metal NaCu4Se4 Synthesized by a Unique Pathway |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/jacs.8b11911 |
| Publisher version: | https://doi.org/10.1021/jacs.8b11911 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10070813 |
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