Journal
PHYSICAL REVIEW X
Volume 8, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.8.011008
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Funding
- Center for Emergent Superconductivity, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Basic Energy Sciences
- U.S. DOE, Office of Science, Office of Basic Energy Sciences [DE-SC00112704]
- Grants-in-Aid for Scientific Research [16H06285] Funding Source: KAKEN
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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 La1.875Ba0.125CuO4. 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 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 YBa2Cu3O6+delta. This indicates that cuprate CDWs may arise from the same underlying instability despite their apparently different low-temperature ordering wave vectors.
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