Physics – Condensed Matter – Superconductivity
Scientific paper
2006-03-14
Nature Physics 2, 537 (2006)
Physics
Condensed Matter
Superconductivity
16 pages, 5 figures
Scientific paper
10.1038/nphys362
The superconducting state of underdoped cuprates is often described in terms of a single energy-scale, associated with the maximum of the (d-wave) gap. Here, we report on electronic Raman scattering results, which show that the gap function in the underdoped regime is characterized by two energy scales, depending on doping in opposite manners. Their ratios to the maximum critical temperature are found to be universal in cuprates. Our experimental results also reveal two different quasiparticle dynamics in the underdoped superconducting state, associated with two regions of momentum space: nodal regions near the zeros of the superconducting gap and antinodal regions. While antinodal quasiparticles quickly loose coherence as doping is reduced, coherent nodal quasiparticles persist down to low doping levels. A theoretical analysis using a new sum-rule allows us to relate the low-frequency-dependence of the Raman response to the temperature-dependence of the superfluid density, both controlled by nodal excitations.
Colson Dorothee
Forget Anne
Gallais Yann
Georges Antoine
Kotliar Gabriel
No associations
LandOfFree
Two Energy Scales and two Quasiparticle Dynamics in the Superconducting State of Underdoped Cuprates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Two Energy Scales and two Quasiparticle Dynamics in the Superconducting State of Underdoped Cuprates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two Energy Scales and two Quasiparticle Dynamics in the Superconducting State of Underdoped Cuprates will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-728801