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Title: Suppression of the commensurate charge density wave phase in ultrathin 1 T - TaS 2 evidenced by Raman hyperspectral analysis

Abstract

Using temperature-dependent and low-frequency Raman spectroscopy, we address the question of how the transition from bulk to a few atomic layers affects the charge density wave (CDW) phases in 1T-TaS2. We find that for crystals with thickness larger than approximate to 10 nm the transition temperatures between the different phases as well as the hysteresis that occurs in the thermal cycle correspond to the ones expected for a bulk sample. However, when the crystals become thinner than approximate to 10 nm, the low-temperature commensurate CDW phases can be suppressed down to the experimentally accessible temperatures (similar to 80 K) upon cooling at moderate rates (similar to 5 K min-1). In addition, even the near commensurate CDW phase is not accessible in few-layer flakes below approximate to 4 nm for even slower cooling rates (similar to 1 K min-1). Finally, we employ Raman hyperspectral imaging to statistically confirm these findings and consider the interlayer coupling and its dynamics to play significant roles in determining the properties of CDW systems consisting of a few unit cells in the vertical direction.

Authors:
 [1];  [2];  [2];  [3];  [3];  [3];  [1];  [2]
  1. Univ. Federal de Minas Gerais (UFMG), Minas Gerais (Brazil)
  2. Univ. of Ottawa, ON (Canada)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Sciences and Engineering Research Council of Canada (NSERC)
OSTI Identifier:
1607448
Grant/Contract Number:  
AC02-06CH11357; RGPIN-2016-06717
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; charge density waves; transition-metals dichalcogenide; ultrathin films; raman spectroscopy

Citation Formats

Ramos, Sergio L. L. M., Plumadore, Ryan, Boddison-Chouinard, Justin, Hla, Saw Wai, Guest, Jeffrey R., Gosztola, David J., Pimenta, Marcos A., and Luican-Mayer, Adina. Suppression of the commensurate charge density wave phase in ultrathin 1T-TaS2 evidenced by Raman hyperspectral analysis. United States: N. p., 2019. Web. https://doi.org/10.1103/PhysRevB.100.165414.
Ramos, Sergio L. L. M., Plumadore, Ryan, Boddison-Chouinard, Justin, Hla, Saw Wai, Guest, Jeffrey R., Gosztola, David J., Pimenta, Marcos A., & Luican-Mayer, Adina. Suppression of the commensurate charge density wave phase in ultrathin 1T-TaS2 evidenced by Raman hyperspectral analysis. United States. https://doi.org/10.1103/PhysRevB.100.165414
Ramos, Sergio L. L. M., Plumadore, Ryan, Boddison-Chouinard, Justin, Hla, Saw Wai, Guest, Jeffrey R., Gosztola, David J., Pimenta, Marcos A., and Luican-Mayer, Adina. Mon . "Suppression of the commensurate charge density wave phase in ultrathin 1T-TaS2 evidenced by Raman hyperspectral analysis". United States. https://doi.org/10.1103/PhysRevB.100.165414. https://www.osti.gov/servlets/purl/1607448.
@article{osti_1607448,
title = {Suppression of the commensurate charge density wave phase in ultrathin 1T-TaS2 evidenced by Raman hyperspectral analysis},
author = {Ramos, Sergio L. L. M. and Plumadore, Ryan and Boddison-Chouinard, Justin and Hla, Saw Wai and Guest, Jeffrey R. and Gosztola, David J. and Pimenta, Marcos A. and Luican-Mayer, Adina},
abstractNote = {Using temperature-dependent and low-frequency Raman spectroscopy, we address the question of how the transition from bulk to a few atomic layers affects the charge density wave (CDW) phases in 1T-TaS2. We find that for crystals with thickness larger than approximate to 10 nm the transition temperatures between the different phases as well as the hysteresis that occurs in the thermal cycle correspond to the ones expected for a bulk sample. However, when the crystals become thinner than approximate to 10 nm, the low-temperature commensurate CDW phases can be suppressed down to the experimentally accessible temperatures (similar to 80 K) upon cooling at moderate rates (similar to 5 K min-1). In addition, even the near commensurate CDW phase is not accessible in few-layer flakes below approximate to 4 nm for even slower cooling rates (similar to 1 K min-1). Finally, we employ Raman hyperspectral imaging to statistically confirm these findings and consider the interlayer coupling and its dynamics to play significant roles in determining the properties of CDW systems consisting of a few unit cells in the vertical direction.},
doi = {10.1103/PhysRevB.100.165414},
journal = {Physical Review B},
number = 16,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic representation of the crystal structure for 1T-TaS2. (b) Summary of the different phases in 1T-TaS2 as a function of temperature. (c) The structure of the CCDW phase; Ta atoms arranged in the Star of David pattern. (d) 8nm x 8nm STM topographic images of a bulkmore » crystal of 1T-TaS2 (T=59K, VBias = 20$mV$ , Itunneling = 2$nA$). (e) Temperature dependence of the resistance of the 1T-TaS2 device indicated in the inset for both the cooling (blue) and warming (red) cycles.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.