Competing soft phonon modes at the charge-density-wave transitions in
Abstract
The family of rare-earth tritellurides RTe3 features charge-density-wave (CDW) order related to strongly momentum-dependent electron-phonon coupling. Similar to other CDW compounds, superconductivity is observed when the CDW order is suppressed via hydrostatic pressure [1]. What sets the heavier members of the RTe3 series apart is the observation of a second CDW transition at lower temperatures having an in-plane ordering wavevector qCDW,2 || [100] of almost the same magnitude but orthogonal to the ordering wavevector qCDW,1 || [001] observed at higher temperatures [2]. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of DyTe3. In particular, we show that there are several phonon modes along both in-plane directions, which respond to the onset of the CDW transition at TCDW,1 = 308 K. Surprisingly, these soft modes close to qCDW,2 = (0.68, 0, 0) show strong softening near TCDW,1 but do not exhibit any response to the lower-temperature transition at TCDW,2 = 68 K. Furthermore our results indicate that the low-temperature CDW order is not just the 90° rotated analogue of the one appearing at high temperatures.
- Authors:
-
- Karlsruhe Institute of Technology, Karlsruhe (Germany); Delft Univ. of Technology, Delft (The Netherlands)
- Karlsruhe Institute of Technology, Karlsruhe (Germany); Vienna Univ. of Technology, Vienna (Austria)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Karlsruhe Institute of Technology, Karlsruhe (Germany)
- Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1474140
- Alternate Identifier(s):
- OSTI ID: 1469738
- Grant/Contract Number:
- AC02-06CH11357; AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 9; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Maschek, M., Zocco, D. A., Rosenkranz, S., Heid, R., Said, A. H., Alatas, A., Walmsley, P., Fisher, I. R., and Weber, F. Competing soft phonon modes at the charge-density-wave transitions in DyTe3. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.98.094304.
Maschek, M., Zocco, D. A., Rosenkranz, S., Heid, R., Said, A. H., Alatas, A., Walmsley, P., Fisher, I. R., & Weber, F. Competing soft phonon modes at the charge-density-wave transitions in DyTe3. United States. https://doi.org/10.1103/PhysRevB.98.094304
Maschek, M., Zocco, D. A., Rosenkranz, S., Heid, R., Said, A. H., Alatas, A., Walmsley, P., Fisher, I. R., and Weber, F. Wed .
"Competing soft phonon modes at the charge-density-wave transitions in DyTe3". United States. https://doi.org/10.1103/PhysRevB.98.094304. https://www.osti.gov/servlets/purl/1474140.
@article{osti_1474140,
title = {Competing soft phonon modes at the charge-density-wave transitions in DyTe3},
author = {Maschek, M. and Zocco, D. A. and Rosenkranz, S. and Heid, R. and Said, A. H. and Alatas, A. and Walmsley, P. and Fisher, I. R. and Weber, F.},
abstractNote = {The family of rare-earth tritellurides RTe3 features charge-density-wave (CDW) order related to strongly momentum-dependent electron-phonon coupling. Similar to other CDW compounds, superconductivity is observed when the CDW order is suppressed via hydrostatic pressure [1]. What sets the heavier members of the RTe3 series apart is the observation of a second CDW transition at lower temperatures having an in-plane ordering wavevector qCDW,2 || [100] of almost the same magnitude but orthogonal to the ordering wavevector qCDW,1 || [001] observed at higher temperatures [2]. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of DyTe3. In particular, we show that there are several phonon modes along both in-plane directions, which respond to the onset of the CDW transition at TCDW,1 = 308 K. Surprisingly, these soft modes close to qCDW,2 = (0.68, 0, 0) show strong softening near TCDW,1 but do not exhibit any response to the lower-temperature transition at TCDW,2 = 68 K. Furthermore our results indicate that the low-temperature CDW order is not just the 90° rotated analogue of the one appearing at high temperatures.},
doi = {10.1103/PhysRevB.98.094304},
journal = {Physical Review B},
number = 9,
volume = 98,
place = {United States},
year = {Wed Sep 12 00:00:00 EDT 2018},
month = {Wed Sep 12 00:00:00 EDT 2018}
}
Web of Science
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