skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Narrowband noise study of sliding charge density waves in NbSe 3 nanoribbons

Abstract

Transport properties (dc electrical resistivity, threshold electric field, and narrow-band noise) are reported for nanoribbon specimens of NbSe 3 with thicknesses as low as 18 nm. As the sample thickness decreases, the resistive anomalies characteristic of the charge density wave (CDW) state are suppressed and the threshold fields for nonlinear CDW conduction apparently diverge. Narrow-band noise measurements allow determination of the concentration of carriers condensed in the CDW state n c , reflective of the CDW order parameter Δ. Although the CDW transition temperatures are relatively independent of sample thickness, in the lower CDW state Δ decreases dramatically with decreasing sample thickness.

Authors:
 [1]; ORCiD logo [1];  [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Kavli Energy NanoSciences Inst., Berkeley, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); LBNL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
OSTI Identifier:
1411650
Grant/Contract Number:
AC02-05CH11231; DMR-1206512
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 2; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; sliding charge density wave; niobium triselenide; nanoribbon; narrowband noise

Citation Formats

Onishi, Seita, Jamei, Mehdi, and Zettl, Alex. Narrowband noise study of sliding charge density waves in NbSe3 nanoribbons. United States: N. p., 2017. Web. doi:10.1088/1367-2630/aa5912.
Onishi, Seita, Jamei, Mehdi, & Zettl, Alex. Narrowband noise study of sliding charge density waves in NbSe3 nanoribbons. United States. doi:10.1088/1367-2630/aa5912.
Onishi, Seita, Jamei, Mehdi, and Zettl, Alex. Thu . "Narrowband noise study of sliding charge density waves in NbSe3 nanoribbons". United States. doi:10.1088/1367-2630/aa5912. https://www.osti.gov/servlets/purl/1411650.
@article{osti_1411650,
title = {Narrowband noise study of sliding charge density waves in NbSe3 nanoribbons},
author = {Onishi, Seita and Jamei, Mehdi and Zettl, Alex},
abstractNote = {Transport properties (dc electrical resistivity, threshold electric field, and narrow-band noise) are reported for nanoribbon specimens of NbSe3 with thicknesses as low as 18 nm. As the sample thickness decreases, the resistive anomalies characteristic of the charge density wave (CDW) state are suppressed and the threshold fields for nonlinear CDW conduction apparently diverge. Narrow-band noise measurements allow determination of the concentration of carriers condensed in the CDW state n c , reflective of the CDW order parameter Δ. Although the CDW transition temperatures are relatively independent of sample thickness, in the lower CDW state Δ decreases dramatically with decreasing sample thickness.},
doi = {10.1088/1367-2630/aa5912},
journal = {New Journal of Physics},
number = 2,
volume = 19,
place = {United States},
year = {Thu Jan 12 00:00:00 EST 2017},
month = {Thu Jan 12 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share:
  • The authors report NMR measurements of the /sup 93/Nb resonance in the charge-density-wave (CDW) conductor NbSe/sub 3/ on aligned, multicrystalline samples. They have observed the resonance with and without current flow in the sample at temperatures above 59 K, where a single incommensurate CDW is present. Results include (1) a demonstration that the CDW is not discommensurate, (2) quantitative measurements of CDW displacements below threshold, and (3) evidence, including current-induced motional narrowing, of CDW motion throughout the entire sample, above the threshold.
  • We report synchrotron based high-resolution x-ray scattering and in situ electronic transport measurements of the Q{sub 1} and Q{sub 2} charge-density waves (CDW's) in NbSe{sub 3} as a function of applied electric field in the low-temperature ''switching'' regime. Detailed analysis of the line shape of the x-ray satellite peaks demonstrates that the Q{sub 2} CDW changes state when it depins at E{sub T} but does not exhibit any abrupt structural change at E{sub T}{sup *}, where the collective CDW current abruptly increases. In contrast, the Q{sub 1} CDW does not exhibit structural changes at E{sub T} but abruptly changes statemore » at E{sub T}{sup *} to a structure very similar to the structure of the sliding Q{sub 1} at high temperatures. These data demonstrate coupling between the Q{sub 2} and Q{sub 1} CDW's.« less
  • We have measured the resistance and critical fields of a series of alloys of Ti and Ta substituted for Nb in NbSe/sub 3/. For concentrations of 5 at. % Ta and 0.1 at. % Ti we find that the charge-density-wave transitions are greatly smeared or suppressed and that the alloys become bulk anisotropic superconductors. Our results are discussed in terms of the competition between the charge-density waves and superconductivity for states at the Fermi surface.
  • The charge-density wave (CDW) structure in NbSe/sub 3/ due to the two independent CDW's has been imaged by scanning microscopy. As predicted by band-structure considerations, the CDW modulation is observed to be substantially localized on different chains for the separate CDW's. AT 77 K where only the high-temperature CDW exists, a relatively weak modulation with a single component along the b axis is observed. At 4.2 K the low-temperature CDW contributes a much stronger approx.4b/sub 0/ x 2c/sub 0/ superlattice modulation.
  • The magnetotransport properties of NbSe{sub 3} in the temperature range below the second charge-density-wave (CDW) onset of 59 K have been studied in magnetic fields up to 230 kG. At liquid-helium temperatures giant magnetoquantum oscillations caused by magnetic breakdown (MB) between the normal Fermi surface (FS) and open orbits on the nested sheets of the FS dominate the magnetotransport and are extremely sensitive to the pinned CDW configuration. Spatial variations in the phase of the pinned CDW change the local Fermi level and CDW gap, giving rise to a distribution of FS cross-sectional areas. These variations in FS cross sectionmore » and CDW gap produce frequency shifts, amplitude modulations, and beat structures in the quantum oscillations observed in both the magnetoresistance and Hall effect. A model conductivity tensor has been developed describing the open-orbit network and MB interference as well as the closed-orbit contribution. The adjustable parameters of the model are the frequency of oscillation, the frequency-distribution spread {Delta}{ital F}, and critical MB parameter {omega}{sub 0}{tau}.« less