# Quasiparticle spectrum of the cuprate BiSrCaCuO: Possible connection to the phase diagram

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We previously introduced T. Cren et al., Europhys. Lett. 52, 203 2000 an energy-dependant gap function, $\DeltaE$, that fits the unusual shape of the quasiparticle QP spectrum for both BiSrCaCuO and YBaCuO. A simple anti-resonance in $\DeltaE$ accounts for the pronounced QP peaks in the density of states, at an energy $\Delta p$, and the dip feature at a higher energy, $E {dip}$. 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 $E \Delta p$, the total spectral gap is $\DeltaE \simeq \Delta p + \Delta \phi$, where $\Delta \phi$ is tied to the condensation energy. From the available data, a simple $p$-dependance of $\Delta p$ and $\Delta \phi$ is found, in particular $\Delta \phip \simeq 2.3 k B T cp$. These two distinct energy scales of the superconducting state are interpreted by comparing with the normal and pseudogap states. The various forms of the QP density of states, as well as the spectral function $Ak,E$, are discussed.

Autor: W. Sacks; T. Cren; D. Roditchev; B. Doucot

Fuente: https://archive.org/