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Emergent symmetry in TbTe3 revealed by ultrafast reflectivity under anisotropic strain

Journal Article · · Reports on Progress in Physics
 [1];  [2];  [3];  [3];  [2];  [2]
  1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Daegu Gyeongbuk Institute of Science and Technology (DGIST) (Korea, Republic of)
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  3. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)

Here, we report ultrafast reflectivity measurements of the dynamics of the order parameter of the charge density wave (CDW) in TbTe3 under anisotropic strain. We observe an increase in the frequency of the amplitude mode with increasing tensile strain along the a-axis (which drives the lattice into a > c, with a and c the lattice constants), and similar behavior for tensile strain along c (c > a). This suggests that both strains stabilize the corresponding CDW order and further support the near equivalence of the CDW phases oriented in a- and c-axis, in spite of the orthorhombic space group. The results were analyzed within the time-dependent Ginzburg–Landau framework, which agrees well with the reflectivity dynamics. Our study presents an ultrafast approach to assess the stability of phases and order parameter dynamics in strained systems.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2584758
Journal Information:
Reports on Progress in Physics, Journal Name: Reports on Progress in Physics Journal Issue: 10 Vol. 87; ISSN 1361-6633; ISSN 0034-4885
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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