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Title: Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates

While charge density wave (CDW) instabilities are ubiquitous to superconducting cuprates, the different ordering wave vectors in various cuprate families have hampered a unified description of the CDW formation mechanism. Here, we investigate the temperature dependence of the low-energy phonons in the canonical CDW-ordered cuprate La 1.875Ba 0.125CuO 4. We discover that the phonon softening wave vector associated with CDW correlations becomes temperature dependent in the high-temperature precursor phase and changes from a wave vector of 0.238 reciprocal lattice units (r.l.u.) below the ordering transition temperature to 0.3 r.l.u. at 300 K. This high-temperature behavior also shows that “214”-type cuprates can host CDW correlations at a similar wave vector to previously reported CDW correlations in non-214-type cuprates such as YBa 2Cu 3O 6+δ. This indicates that cuprate CDWs may arise from the same underlying instability despite their apparently different low-temperature ordering wave vectors.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1] ;  [1] ;  [4] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  2. RIKEN SPring-8 Center and JASRI, Sayo Hyogo (Japan). Materials Dynamics Lab. and Research and Utilization Division
  3. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. for Solid State Physics
  4. RIKEN SPring-8 Center, Sayo Hyogo (Japan). Materials Dynamics Lab.
Publication Date:
Report Number(s):
BNL-114837-2017-JAAM
Journal ID: ISSN 2160-3308; PRXHAE
Grant/Contract Number:
SC0012704; 20160097; 20170076
Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Condensed Matter Physics; Strongly Correlated Materials; charge density waves; phonons; cuprates; high-temperature superconductors; superconductors; density functional theory; x-ray scattering
OSTI Identifier:
1417428
Alternate Identifier(s):
OSTI ID: 1425002