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Magnetic-Field Tunable Intertwined Checkerboard Charge Order and Nematicity in the Surface Layer of Sr$_2$RuO$_4$
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- In strongly correlated electron materials, the electronic, spin, and charge degrees of freedom are closely intertwined. This often leads to the stabilization of emergent orders that are highly sensitive to external physical stimuli promising opportunities for technological applications. In perovskite ruthenates, this sensitivity manifests in dramatic changes of the physical properties with subtle structural details of the RuO$_6$ octahedra, stabilizing enigmatic correlated ground states, from a hotly debated superconducting state via electronic nematicity and metamagnetic quantum criticality to ferromagnetism. Here, it is demonstrated that the rotation of the RuO$_6$ octahedra in the surface layer of Sr$_2$RuO$_4$ generates new emergent orders not observed in the bulk material. Through atomic-scale spectroscopic characterization of the low-energy electronic states, four van Hove singularities are identified in the vicinity of the Fermi energy. The singularities can be directly linked to intertwined nematic and checkerboard charge order. Tuning of one of these van Hove singularities by magnetic field is demonstrated, suggesting that the surface layer undergoes a Lifshitz transition at a magnetic field of ~32T. The results establish the surface layer of Sr$_2$RuO$_4$ as an exciting 2D correlated electron system and highlight the opportunities for engineering the low-energy electronic states in these systems.<br />Comment: 26 pages including supplementary material, replaced with published version
- Subjects :
- Electronic structure
Materials science
FOS: Physical sciences
02 engineering and technology
010402 general chemistry
01 natural sciences
Quantum criticality
Condensed Matter - Strongly Correlated Electrons
Condensed Matter::Superconductivity
General Materials Science
Ruthenate perovskites
Spin (physics)
ruthenate perovskites
QC
Superconductivity
strongly correlated electron systems
Condensed matter physics
Strongly Correlated Electrons (cond-mat.str-el)
Mechanical Engineering
Fermi energy
Charge (physics)
Strongly correlated electron systems
DAS
021001 nanoscience & nanotechnology
electronic structure
0104 chemical sciences
Magnetic field
QC Physics
Ferromagnetism
Mechanics of Materials
quantum criticality
Condensed Matter::Strongly Correlated Electrons
Strongly correlated material
0210 nano-technology
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....e83079df6c763f7e8dea1f9372358c6e
- Full Text :
- https://doi.org/10.48550/arxiv.2005.00071