Concomitant charge-density-wave and unit-cell-doubling structural transitions in Dy5Ir4Si10

Min-Hung Lee, C. H. Chen, C. M. Tseng, C. S. Lue, Y. K. Kuo, H. D. Yang, M. W. Chu

Research output: Contribution to journalArticle

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Abstract

The tetragonal rare-earth transition-metal silicide system with three-dimensional crystallographic structure R5T4Si10, where R is Dy, Ho, Er, Tm, and Lu, and T=Ir and Rh, has been shown to exhibit fascinating charge-density-wave (CDW) phase transitions, a phenomenon largely found in otherwise low-dimensional systems. In this study, we report the investigations of CDW in Dy5Ir4Si10 at different temperatures using transmission electron microscopy techniques including electron diffraction and dark-field imaging. Incommensurate superlattice spots along the c axis were observed in the electron-diffraction patterns when the sample was cooled below the CDW transition temperature at ∼208 K. CDW becomes commensurate with further cooling and configurations of CDW dislocations convincingly show that the CDW phase transition is accompanied by a concomitant cell-doubling crystallographic structural phase transition. Intriguingly, the cell-doubling transition is featured by a broken inversion symmetry along the c axis and a disparity in the CDW-modulation vectors with opposite signs, which gives rise to two sets of CDW domains with reversed contrasts. The profound physics underlining this notable domain-contrast behavior is discussed.

Original languageEnglish
Article number195142
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number19
DOIs
Publication statusPublished - 2014 May 29

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Charge density waves
cells
Phase transitions
Electron diffraction
electron diffraction
Diffraction patterns
Rare earths
Superconducting transition temperature
Transition metals
diffraction patterns
rare earth elements
Physics
transition metals
transition temperature
Modulation
inversions
Transmission electron microscopy
Cooling
cooling
Imaging techniques

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Concomitant charge-density-wave and unit-cell-doubling structural transitions in Dy5Ir4Si10. / Lee, Min-Hung; Chen, C. H.; Tseng, C. M.; Lue, C. S.; Kuo, Y. K.; Yang, H. D.; Chu, M. W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 19, 195142, 29.05.2014.

Research output: Contribution to journalArticle

Lee, Min-Hung ; Chen, C. H. ; Tseng, C. M. ; Lue, C. S. ; Kuo, Y. K. ; Yang, H. D. ; Chu, M. W. / Concomitant charge-density-wave and unit-cell-doubling structural transitions in Dy5Ir4Si10. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 89, No. 19.
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