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Title: A Natural 2D Heterostructure [Pb 3.1 Sb 0.9 S 4 ][Au x Te 2–x ] with Large Transverse Nonsaturating Negative Magnetoresistance and High Electron Mobility

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.9b02599· OSTI ID:1524424
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5];  [5];  [5]; ORCiD logo [6]; ORCiD logo [7]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
  3. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
  4. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  6. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
  7. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry, and Dept. of Materials Science and Engineering; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division

We report the two-dimensional (2D) natural hetero-structure [Pb3.1Sb0.9S4][Au$$_x$$Te$$_{2-x}$$] ($$x$$ = 0.52-0.36) which shows anomalous, transverse nonsaturating negative magnetoresistance (MR). For $$x$$ = 0.52, the material has a commensurately modulated structure with alternating [Pb3.1Sb0.9S4] rocksalt layers and atomically thin [Au$$_x$$Te$$_{2-x}$$] sheets, as determined by single-crystal X-ray diffraction using a (3 + 1)-dimensional space group; for other $$x$$ compositions, the modulated structure is absent and the Au and Te atoms are disordered. The transport properties in this system at low temperature (<100 K) are dominated by an unusual 2D hopping mechanism, while at room temperature a high carrier mobility of similar to ~1352 cm2 V-1 s-1 obtained ($$x$$ = 0.36). The confined electrons within the [Au$$_x$$Te$$_{2-x}$$] layers are also exposed to interlayer coupling with the insulating [Pb3.1Sb0.9S4] layers, and as a result, the properties of the heterostructures emerge not only from the constituent layers but also the interactions between them. Furthermore, the various Au and Te coordination patterns found in the [Au$$_x$$Te$$_{2-x}$$] sheets as a function of $$x$$ further contribute to a unique electronic structure that leads to the anomalous nonsaturating negative MR with different field dependent behaviors. First-principles calculations indicate that the [Au$$_x$$Te$$_{2-x}$$] sheets are responsible for the unusual electrical transport properties in this 2D system.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1524424
Journal Information:
Journal of the American Chemical Society, Vol. 141, Issue 18; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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