Defect-inhibited incommensurate distortion in Ta2NiSe7

R. M. Fleming, S. A. Sunshine, C. H. Chen, L. F. Schneemeyer, J. V. Waszczak

Research output: Contribution to journalArticle

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Abstract

We have observed evidence of an incommensurate structural distortion in the ternary chalcogenide Ta2NiSe7. The structure of Ta2NiSe7 is similar to FeNb3Se10 with one tantalum-centered trigonal prismatic chain and two inequivalent chains with octahedral coordination. Anomalies are observed in the resistance and magnetic susceptibility near 52.5 K. X-ray- and electron-diffraction data show the presence of an incommensurate modulation at temperatures below 52.5 K and strong diffuse scattering above 52.5 K. Hysteresis in the resistance and x-ray order parameter suggest that true long-range order of the lattice modulation is never achieved. We interpret the diffuse scattering as resulting from an inhibition of the phase transition caused by strong interactions between the lattice distortion and impurities or defects. Based on the transport data, we interpret the incommensurate structural distortion as being electronic in origin, a charge-density wave.

Original languageEnglish
Pages (from-to)4954-4959
Number of pages6
JournalPhysical Review B
Volume42
Issue number8
DOIs
StatePublished - 1 Jan 1990

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Defects
defects
Modulation
Scattering
Tantalum
magnetic permeability
modulation
Charge density waves
tantalum
Magnetic susceptibility
scattering
Electron diffraction
Hysteresis
x rays
electron diffraction
Phase transitions
hysteresis
Impurities
anomalies
X ray diffraction

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Fleming, R. M., Sunshine, S. A., Chen, C. H., Schneemeyer, L. F., & Waszczak, J. V. (1990). Defect-inhibited incommensurate distortion in Ta2NiSe7. Physical Review B, 42(8), 4954-4959. https://doi.org/10.1103/PhysRevB.42.4954
Fleming, R. M. ; Sunshine, S. A. ; Chen, C. H. ; Schneemeyer, L. F. ; Waszczak, J. V. / Defect-inhibited incommensurate distortion in Ta2NiSe7. In: Physical Review B. 1990 ; Vol. 42, No. 8. pp. 4954-4959.
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Fleming, RM, Sunshine, SA, Chen, CH, Schneemeyer, LF & Waszczak, JV 1990, 'Defect-inhibited incommensurate distortion in Ta2NiSe7', Physical Review B, vol. 42, no. 8, pp. 4954-4959. https://doi.org/10.1103/PhysRevB.42.4954

Defect-inhibited incommensurate distortion in Ta2NiSe7. / Fleming, R. M.; Sunshine, S. A.; Chen, C. H.; Schneemeyer, L. F.; Waszczak, J. V.

In: Physical Review B, Vol. 42, No. 8, 01.01.1990, p. 4954-4959.

Research output: Contribution to journalArticle

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AB - We have observed evidence of an incommensurate structural distortion in the ternary chalcogenide Ta2NiSe7. The structure of Ta2NiSe7 is similar to FeNb3Se10 with one tantalum-centered trigonal prismatic chain and two inequivalent chains with octahedral coordination. Anomalies are observed in the resistance and magnetic susceptibility near 52.5 K. X-ray- and electron-diffraction data show the presence of an incommensurate modulation at temperatures below 52.5 K and strong diffuse scattering above 52.5 K. Hysteresis in the resistance and x-ray order parameter suggest that true long-range order of the lattice modulation is never achieved. We interpret the diffuse scattering as resulting from an inhibition of the phase transition caused by strong interactions between the lattice distortion and impurities or defects. Based on the transport data, we interpret the incommensurate structural distortion as being electronic in origin, a charge-density wave.

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