Competing soft phonon modes at the charge-density-wave transitions in
- 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)
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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- 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
- Grant/Contract Number:
- AC02-06CH11357; AC02-76SF00515
- OSTI ID:
- 1474140
- Alternate ID(s):
- OSTI ID: 1469738
- Journal Information:
- Physical Review B, Vol. 98, Issue 9; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Light-induced charge density wave in LaTe3
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journal | November 2019 |
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