Influence of defects on the charge density wave of ([SnSe]1+δ)1(VSe2)1 ferecrystals
Abstract
A series of ferecrystalline compounds ([SnSe]1+δ)1(VSe2)1 with varying Sn/V ratios were synthesized using the modulated elemental reactant technique. Temperature-dependent specific heat data reveal a phase transition at 102 K, where the heat capacity changes abruptly. An abrupt increase in electrical resistivity occurs at the same temperature, correlated with an abrupt increase in the Hall coefficient. Combined with the magnitude and nature of the specific heat discontinuity, this suggests that the transition is similar to the charge density wave transitions in transition metal dichalcogenides. An ordered intergrowth was formed over a surprisingly wide compositional range of Sn/V ratios of 0.89 ≤ 1 + δ ≤ 1.37. X-ray diffraction and transmission electron microscopy reveal the formation of various volume defects in the compounds in response to the nonstoichiometry. The electrical resistivity and Hall coefficient data of samples with different Sn/V ratios show systematic variation in the carrier concentration with the Sn/V ratio. There is no significant change in the onset temperature of the charge density wave transition, only a variation in the carrier densities before and after the transition. Given the sensitivity of the charge density wave transitions of transition metal dichalcogenides to variations in composition, it is very surprising that themore »
- Authors:
-
- Univ. of Oregon, Eugene, OR (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1227721
- Report Number(s):
- LA-UR-15-24766
Journal ID: ISSN 1936-0851
- Grant/Contract Number:
- DMR1266217; CHE1102637; AC52-06NA25396
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 8; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; charge density wave; intergrowth compounds; ferecrystals; stacking defects; heat capacity; carrier concentration
Citation Formats
Falmbigl, Matthias, Putzky, Daniel, Ditto, Jeffrey, Esters, Marco, Bauers, Sage R., Ronning, Filip, and Johnson, David C. Influence of defects on the charge density wave of ([SnSe]1+δ)1(VSe2)1 ferecrystals. United States: N. p., 2015.
Web. doi:10.1021/acsnano.5b03361.
Falmbigl, Matthias, Putzky, Daniel, Ditto, Jeffrey, Esters, Marco, Bauers, Sage R., Ronning, Filip, & Johnson, David C. Influence of defects on the charge density wave of ([SnSe]1+δ)1(VSe2)1 ferecrystals. United States. https://doi.org/10.1021/acsnano.5b03361
Falmbigl, Matthias, Putzky, Daniel, Ditto, Jeffrey, Esters, Marco, Bauers, Sage R., Ronning, Filip, and Johnson, David C. 2015.
"Influence of defects on the charge density wave of ([SnSe]1+δ)1(VSe2)1 ferecrystals". United States. https://doi.org/10.1021/acsnano.5b03361. https://www.osti.gov/servlets/purl/1227721.
@article{osti_1227721,
title = {Influence of defects on the charge density wave of ([SnSe]1+δ)1(VSe2)1 ferecrystals},
author = {Falmbigl, Matthias and Putzky, Daniel and Ditto, Jeffrey and Esters, Marco and Bauers, Sage R. and Ronning, Filip and Johnson, David C.},
abstractNote = {A series of ferecrystalline compounds ([SnSe]1+δ)1(VSe2)1 with varying Sn/V ratios were synthesized using the modulated elemental reactant technique. Temperature-dependent specific heat data reveal a phase transition at 102 K, where the heat capacity changes abruptly. An abrupt increase in electrical resistivity occurs at the same temperature, correlated with an abrupt increase in the Hall coefficient. Combined with the magnitude and nature of the specific heat discontinuity, this suggests that the transition is similar to the charge density wave transitions in transition metal dichalcogenides. An ordered intergrowth was formed over a surprisingly wide compositional range of Sn/V ratios of 0.89 ≤ 1 + δ ≤ 1.37. X-ray diffraction and transmission electron microscopy reveal the formation of various volume defects in the compounds in response to the nonstoichiometry. The electrical resistivity and Hall coefficient data of samples with different Sn/V ratios show systematic variation in the carrier concentration with the Sn/V ratio. There is no significant change in the onset temperature of the charge density wave transition, only a variation in the carrier densities before and after the transition. Given the sensitivity of the charge density wave transitions of transition metal dichalcogenides to variations in composition, it is very surprising that the charge density wave transition observed at 102 K for ([SnSe]1.15)1(VSe2)1 is barely influenced by the nonstoichiometry and structural defects. As a result, this might be a consequence of the two-dimensional nature of the structurally independent VSe2 layers.},
doi = {10.1021/acsnano.5b03361},
url = {https://www.osti.gov/biblio/1227721},
journal = {ACS Nano},
issn = {1936-0851},
number = 8,
volume = 9,
place = {United States},
year = {Tue Jul 14 00:00:00 EDT 2015},
month = {Tue Jul 14 00:00:00 EDT 2015}
}
Web of Science
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