Physics – Condensed Matter – Superconductivity
Scientific paper
2010-01-10
Physica B 404, 354 (2009)
Physics
Condensed Matter
Superconductivity
proceeding of the ECRYS-2008
Scientific paper
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.
Audouard Alain
Bonn Douglas A.
Hardy Walter N.
Hussey Nigel E.
Jaudet Cyril
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