Spin-Order Driven Fermi Surface Reconstruction Revealed by Quantum Oscillations in an Underdoped High Tc Superconductor
Suchitra E. Sebastian, N. Harrison, C. H Mielke, Ruixing Liang, D. A. Bonn, W. N. Hardy, G. G. Lonzarich
DOI 10.1103/PhysRevLett.103.256405 · Physical Review Letters
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Abstract
We use quantum oscillation measurements to distinguish between spin and orbital components of the lowest energy quasiparticle excitations in YBa2Cu3O6.54, each of which couple differently to a magnetic field. Our measurements reveal the phase of the observed quantum oscillations to remain uninverted over a wide angular range, indicating that the twofold spin degeneracy of the Landau levels is virtually unaltered by the magnetic field. The inferred suppression of the spin degrees of freedom indicates a spin-density wave is responsible for creation of the small Fermi surface pockets in underdoped YBa2Cu3O6+x—further suggesting that excitations of this phase are important contributors to the unconventional superconducting pairing mechanism.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.54 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 58.7 | Pressure not reported | unknown |
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