Back to Search
Start Over
Quasiparticle spectrum of the cuprateBi2Sr2CaCu2O8+δ: Possible connection to the phase diagram
- Source :
- Physical Review B. 74
- Publication Year :
- 2006
- Publisher :
- American Physical Society (APS), 2006.
-
Abstract
- We previously introduced [T. Cren et al., Europhys. Lett. 52, 203 (2000)] an energy-dependant gap function, $\ensuremath{\Delta}(E)$, that fits the unusual shape of the quasiparticle (QP) spectrum for both BiSrCaCuO and YBaCuO. A simple anti-resonance in $\ensuremath{\Delta}(E)$ accounts for the pronounced QP peaks in the density of states, at an energy ${\ensuremath{\Delta}}_{p}$, and the dip feature at a higher energy, ${E}_{\text{dip}}$. Here we go a step further, our gap function is consistent with the $(T,p)$ phase diagram, where $p$ is the carrier density. For large QP energies $(E⪢{\ensuremath{\Delta}}_{p})$, the total spectral gap is $\ensuremath{\Delta}(E)\ensuremath{\simeq}{\ensuremath{\Delta}}_{p}+{\ensuremath{\Delta}}_{\ensuremath{\varphi}}$, where ${\ensuremath{\Delta}}_{\ensuremath{\varphi}}$ is tied to the condensation energy. From the available data, a simple $p$ dependance of ${\ensuremath{\Delta}}_{p}$ and ${\ensuremath{\Delta}}_{\ensuremath{\varphi}}$ is found, in particular, ${\ensuremath{\Delta}}_{\ensuremath{\varphi}}(p)\ensuremath{\simeq}2.3{k}_{B}{T}_{c}(p)$. These two distinct energy scales of the superconducting state are interpreted by comparing to the normal and pseudogap states. The various forms of the QP density of states, as well as the spectral function $A(\mathbf{k},E)$, are discussed.
- Subjects :
- Physics
Superconductivity
Condensed matter physics
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Electronic, Optical and Magnetic Materials
0103 physical sciences
Quasiparticle
Density of states
Spectral gap
Connection (algebraic framework)
010306 general physics
0210 nano-technology
Pseudogap
Energy (signal processing)
Phase diagram
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 74
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........1725bac9d8b977aee55afcb965e9c9e1