Physics – Condensed Matter – Superconductivity
Scientific paper
2009-07-17
Phys. Rev. Lett. 103, 256405 (2009)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevLett.103.256405
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.
Bonn Douglas A.
Hardy Walter N.
Harrison Neil
Liang Ruixing
Lonzarich Gilbert G.
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