期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 30, 页码 E3026-E3032出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1406297111
关键词
CuO2 pseudogap; broken symmetry; density-wave form factor
资金
- Center for Emergent Superconductivity, an Energy Frontier Research Center, headquartered at Brookhaven National Laboratory
- US Department of Energy (DOE) [DE-2009-BNL-PM015]
- Ministry of Science and Education (Japan)
- Global Centers of Excellence Program for the Japan Society for the Promotion of Science (JSPS)
- Fluc Team program at Brookhaven National Laboratory [DE-AC02-98CH10886]
- Engineering and Physical Sciences Research Council
- JSPS KAKENHI [19840052, 20244060]
- US DOE [DE-SC0010313]
- National Science Foundation [DMR-1103860]
- Templeton Foundation
- Engineering and Physical Sciences Research Council [EP/I031014/1, 1265368] Funding Source: researchfish
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1103860, 0955822] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [20244060, 19840052] Funding Source: KAKEN
- U.S. Department of Energy (DOE) [DE-SC0010313] Funding Source: U.S. Department of Energy (DOE)
- EPSRC [EP/I031014/1] Funding Source: UKRI
The identity of the fundamental broken symmetry (if any) in the underdoped cuprates is unresolved. However, evidence has been accumulating that this state may be an unconventional density wave. Here we carry out site-specific measurements within each CuO2 unit cell, segregating the results into three separate electronic structure images containing only the Cu sites [Cu(r)] and only the x/y axis O sites [O-x(r) and O-y(r)]. Phase-resolved Fourier analysis reveals directly that the modulations in the O-x(r) and O-y(r) sublattice images consistently exhibit a relative phase of pi. We confirm this discovery on two highly distinct cuprate compounds, ruling out tunnel matrix-element and materials-specific systematics. These observations demonstrate by direct sublattice phase-resolved visualization that the density wave found in underdoped cuprates consists of modulations of the intraunit-cell states that exhibit a predominantly d-symmetry form factor.
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