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Title: Nanoscale measurement of Nernst effect in two-dimensional charge density wave material 1T-TaS2

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5004804· OSTI ID:1422389
 [1];  [2];  [3]
  1. Univ. of Rochester, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Materials Science Division
  2. Univ. of Rochester, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Nanoscience and Technology Division; Univ. of Ottawa, Ottawa, ON (Canada). Dept. of Physics
  3. Argonne National Laboratory (ANL), Argonne, IL (United States). Materials Science Division and Nanoscience and Technology Division

Advances in nanoscale material characterization on two-dimensional van der Waals layered materials primarily involve their optical and electronic properties. The thermal properties of these materials are harder to access due to the difficulty of thermal measurements at the nanoscale. In this work, we create a nanoscale magnetothermal device platform to access the basic out-of-plane magnetothermal transport properties of ultrathin van der Waals materials. Specifically, the Nernst effect in the charge density wave transition metal dichalcogenide 1T-TaS2 is examined on nano-thin flakes in a patterned device structure. It is revealed that near the commensurate charge density wave (CCDW) to nearly commensurate charge density wave (NCCDW) phase transition, the polarity of the Nernst effect changes. Since the Nernst effect is especially sensitive to changes in the Fermi surface, this suggests that large changes are occurring in the out-of-plane electronic structure of 1T-TaS2, which are otherwise unresolved in just in-plane electronic transport measurements. This may signal a coherent evolution of out-of-plane stacking in the CCDW! NCCDW transition.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1422389
Alternate ID(s):
OSTI ID: 1410711
Journal Information:
Applied Physics Letters, Vol. 111, Issue 22; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (3)

Negative differential resistance observed on the charge density wave of a transition metal dichalcogenide journal January 2019
Observation of large anomalous Nernst effect in 2D layered materials Fe 3 GeTe 2 journal November 2019
Large magnetothermopower and anomalous Nernst effect in HfTe 5 journal September 2019

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