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Title: Competing soft phonon modes at the charge-density-wave transitions in DyT e 3

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [3];  [3];  [5];  [6];  [4]
  1. Karlsruhe Institute of Technology, Karlsruhe (Germany); Delft Univ. of Technology, Delft (The Netherlands)
  2. Karlsruhe Institute of Technology, Karlsruhe (Germany); Vienna Univ. of Technology, Vienna (Austria)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Karlsruhe Institute of Technology, Karlsruhe (Germany)
  5. Stanford Univ., Stanford, CA (United States)
  6. 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
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Light-induced charge density wave in LaTe3 journal November 2019

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