Evolution of the bosonic spectral density of the high-temperature superconductor Bi2Sr2CaCu2O8+δ

J. Hwang; T. Timusk; E. Schachinger; J. P. Carbotte

doi:10.1103/PhysRevB.75.144508

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Evolution of the bosonic spectral density of the high-temperature superconductor Bi2Sr2CaCu2O8+δ

J. Hwang, T. Timusk, E. Schachinger, J. P. Carbotte

DOI 10.1103/PhysRevB.75.144508 · Physical Review B

T1

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Abstract

We demonstrate that an Eliashberg inversion of the optical self-energy, based on maximum-entropy considerations, can be used to extract in numerical form the bosonic excitation spectra of high-transition-temperature superconductors. In Bi2Sr2CaCu2O8+δ we explicitly show that the bosonic mode that dominates the self-energy at low temperatures and small energies directly evolves out of a balanced transfer of spectral weight to the mode from the continuum just above it. This redistribution starts already at 200K in optimally doped materials but is much weaker in overdoped samples. This finding presents a challenge to theories of the spin susceptibility and to neutron scattering experiments in high-temperature superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	96	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	82	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60	Pressure not reported	unknown
YBa2Cu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown