AI Article Synopsis
- Quantum oscillations were observed in underdoped YBa2Cu3O6.56 across a magnetic field range of 24 to 101 T, revealing three distinct low frequencies around 440, 532, and 620 T.
- The study demonstrates that a small bilayer coupling at the nodal points splits the nodal pocket into bonding and antibonding orbits, resulting in a frequency sequence and beat pattern that match the experimental findings.
- The relative amplitudes of these frequencies in the measurements are aligned with calculations using a nodal bilayer gap, which correlates with values obtained from photoemission experiments in the underdoped region.
Article Abstract
We report quantum oscillations in underdoped YBa2Cu3O6.56 over a significantly large range in magnetic field extending from ≈24 to 101 T, enabling three well-spaced low frequencies at ≈440±10, 532±2, and 620±10 T to be clearly resolved. We show that a small nodal bilayer coupling that splits a nodal pocket into bonding and antibonding orbits yields a sequence of frequencies, F0-ΔF, F0, and F0+ΔF and accompanying beat pattern similar to that observed experimentally, on invoking magnetic breakdown tunneling at the nodes. The relative amplitudes of the multiple frequencies observed experimentally in quantum oscillation measurements are shown to be reproduced using a value of nodal bilayer gap quantitatively consistent with that measured in photoemission experiments in the underdoped regime.
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| http://dx.doi.org/10.1103/PhysRevLett.108.196403 | DOI Listing |
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