Universal quantum oscillations in the underdoped cuprate superconductors
By N. Barišić, S. Badoux, M. Chan, C. Dorow, W. Tabiś, B. Vignolle, G. Yu, J. Béard, Xudong Zhao, C. Proust and 1 more. Nature Physics, 2013
138 citations recorded by the source corpus.
Every metal has an underlying Fermi surface that gives rise to quantum oscillations. So far, quantum oscillation measurements in the superconductor YBCO have been inconclusive owing to the structural complexities of the material. Quantum oscillations in a Hg-based cuprate—with a much simpler structure—help to establish the origin and universality of the oscillations. The metallic state of the underdoped high- Tc cuprates has remained an enigma: how may seemingly disconnected Fermi-surface segments, observed in zero magnetic field as a result of the opening of a partial gap (the pseudogap), possess conventional quasiparticle properties1,2,3? How do the small Fermi-surface pockets evidenced by the observation of quantum oscillations emerge as superconductivity is suppressed in high magnetic fields4,5,6,7,8,9,10,11? Such quantum oscillations, discovered in underdoped YBa2Cu3O6.5 (Y123; ref. 12) and YBa2Cu4O8 (Y124; ref. 13), signify the existence of a conventional Fermi surface3,14,15. However, owing to the complexity of the crystal structures of Y123 and Y124 (CuO2 double layers, CuO chains, low structural symmetry), it has remained unclear whether the quantum oscillations are specific to this particular family of cuprates5,16,17,18. Numerous theoretical proposals have been put forward to explain the source of quantum oscillations, including materials-specific scenarios involving CuO chains and scenarios involving the quintessential CuO2 planes6,11,18. Here we report the observation of quantum oscillations in underdoped HgBa2CuO4+δ (Hg1201), a model cuprate superconductor with individual CuO2 layers, high tetragonal symmetry and no CuO chains. This observation proves that quantum oscillations are a universal property of the underdoped CuO2 planes, and it opens the door to quantitative future studies of the metallic state and of the Fermi-surface reconstruction phenomenon in this structurally simplest cuprate.
Subfields: Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/40e91f4421d65d651145c3f02e77771ff4afbb84
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In Condensed Matter Physics
Citations in the corpus
- Amperean pairing and the pseudogap phase of cuprate superconductors (2014, background): “The recent observation of quantum oscillation and CDW in the Hg1201 compound found a pocket area that is larger than that of YBCO, while the CDW wave vector is shorter [42].”