Superconductivity-induced resonant Raman scattering in multilayer high-Tc superconductors

Mikhail Limonov; Sergey Lee; Setsuko Tajima; Akio Yamanaka

doi:10.1103/PhysRevB.66.054509

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Superconductivity-induced resonant Raman scattering in multilayer high-Tc superconductors

Mikhail Limonov, Sergey Lee, Setsuko Tajima, Akio Yamanaka

DOI 10.1103/PhysRevB.66.054509 · Physical Review B

T1

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Abstract

Resonant Raman scattering below Tc has been discovered in several Bi-, Hg-, and Tl-based high-Tc superconductors with three or four CuO2 layers. For Bi2Si2Ca2Cu3O10+δ, we found an unexpected crossover of the pair-breaking peak in the A1g spectrum from a broad bump at ħω=6kBTc for Eexc=2.54eV to a sharp peak at ħω=8kBTc for Eexc=2.18eV, together with a strong enhancement of the Ca phonons. Under resonant conditions, the relative positions of the pair breaking peaks in A1g, B1g, and B2g channels are 2Δ(A1g)=2Δ(B1g)>2Δ(B2g). This relation implies that the A1g Raman channel is free from the Coulomb screening effect, just as predicted theoretically for a d-wave multilayer superconductor but have never been observed experimentally thus far. The observed resonance effect is evidence that the electronic state in the inner CuO2 planes is different from that of the outer CuO2 planes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	unknown
Bi2Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	109	Pressure not reported	unknown
Tl0.5Pb0.5Sr2Ca2Cu3O9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	118	Pressure not reported	unknown
HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	133	Pressure not reported	unknown
Hg(Sr,Ba)2Ca3Cu4O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	115	Pressure not reported	unknown