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Quantum oscillations in the underdoped cuprate YBa2Cu4O8
E A Yelland1, J Singleton, C H Mielke
1H. H. Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
Physical Review Letters
|March 21, 2008
Summary
Quantum oscillations reveal Fermi surface pockets in underdoped YBa2Cu4O8 superconductor. These findings suggest pockets are common in copper oxide planes, offering insights into Fermi surface doping dependence.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Underdoped cuprate superconductors exhibit complex electronic properties.
- Understanding the Fermi surface is crucial for explaining superconductivity in these materials.
Purpose of the Study:
- To investigate quantum oscillations in YBa2Cu4O8 under high magnetic fields.
- To determine the characteristics of the Fermi surface in underdoped cuprates.
Main Methods:
- Utilized a tunnel-diode oscillator technique.
- Applied pulsed magnetic fields up to 85 Tesla.
- Analyzed quantum oscillations periodic in inverse field.
Main Results:
- Observed clear quantum oscillations with a frequency of 660±15 T.
- Detected potential evidence for two distinct frequency components.
- Determined the quasiparticle mass to be m(*)=3.0±0.3m(e).
Conclusions:
- Fermi surface pockets are likely a general feature in underdoped copper oxide planes.
- The study provides valuable data on the doping dependence of the Fermi surface.
- Results align with previous findings in YBa2Cu3O6.5, supporting a unified picture.
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