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Quantum oscillations in underdoped YBa_2Cu_3O_6.5
- Source :
- Physica B 404, 354 (2009)
- Publication Year :
- 2010
-
Abstract
- Shubnikov-de Haas and de Haas-van Alphen effects have been measured in the underdoped high temperature superconductor YBa$_2$Cu$_3$O$_{6.51}$. Data are in agreement with the standard Lifshitz-Kosevitch theory, which confirms the presence of a coherent Fermi surface in the ground state of underdoped cuprates. A low frequency $F = 530 \pm 10$ T is reported in both measurements, pointing to small Fermi pocket, which corresponds to 2% of the first Brillouin zone area only. This low value is in sharp contrast with that of overdoped Tl$_2$Ba$_2$CuO$_{6+\delta}$, where a high frequency $F = 18$ kT has been recently reported and corresponds to a large hole cylinder in agreement with band structure calculations. These results point to a radical change in the topology of the Fermi surface on opposing sides of the cuprate phase diagram.<br />Comment: proceeding of the ECRYS-2008
Details
- Database :
- arXiv
- Journal :
- Physica B 404, 354 (2009)
- Publication Type :
- Report
- Accession number :
- edsarx.1001.1508
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.physb.2008.11.029