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Single reconstructed Fermi surface pocket in an underdoped single-layer cuprate superconductor
M K Chan1,2, N Harrison1, R D McDonald1
1Pulsed Field Facility, National High Magnetic Field Laboratory, Los Alamos National Laboratory, Mail Stop E536, Los Alamos, New Mexico 87545, USA.
Nature Communications
|July 23, 2016
Summary
Researchers identified a biaxial charge density wave in HgBa2CuO4+δ (Hg1201) cuprates using quantum oscillations. This finding clarifies the Fermi surface reconstruction in the pseudogap regime.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Quantum oscillations in hole-doped cuprates reveal broken symmetry states in the pseudogap regime.
- Previous studies faced challenges due to complex spectra and bilayer effects, hindering conclusive identification.
Purpose of the Study:
- To overcome limitations in studying Fermi surface reconstruction in cuprates.
- To identify the specific broken symmetry state responsible for Fermi surface reconstruction in HgBa2CuO4+δ (Hg1201).
Main Methods:
- High-resolution quantum oscillation measurements on HgBa2CuO4+δ (Hg1201).
- Analysis of oscillatory components and magnetic breakdown tunneling.
- Quantitative modeling of Fermi surface reconstruction.
Main Results:
- Hg1201 exhibits a single oscillatory component, indicating a simple Fermi surface.
- The Fermi surface consists of a single quasi-two-dimensional pocket.
- A biaxial charge density wave within CuO2 planes is identified as the cause of reconstruction.
- Criss-crossed charge stripes between layers are ruled out as an explanation.
Conclusions:
- The study elucidates the Fermi surface reconstruction in Hg1201, attributing it to a biaxial charge density wave.
- The gap between reconstructed pockets is a significant fraction of the pseudogap energy.
- This work provides a clearer understanding of broken symmetry states in cuprates.
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