Raman scattering from superconducting gap excitations in Tl2Ca2Ba2Cu3O10 single crystals

M. C. Krantz; H. J. Rosen; J. Y. T. Wei; D. E. Morris

doi:10.1103/PhysRevB.40.2635

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Raman scattering from superconducting gap excitations in Tl2Ca2Ba2Cu3O10 single crystals

M. C. Krantz, H. J. Rosen, J. Y. T. Wei, D. E. Morris

DOI 10.1103/PhysRevB.40.2635 · Physical Review B

T1

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Abstract

Raman spectra taken from several well-characterized superconducting Tl2Ca2Ba2Cu3O10 (2:2:2:3) single crystals (Tc=105 K) display the characteristic phonon spectrum of the 2:2:2:3 phase on top of a broad background continuum interpreted as electronic scattering. The electronic scattering continuum decreases substantially below Tc for frequency shifts of smaller than 400 cm−1, indicating the formation of a superconducting gap. The gap does not show the expected abrupt onset but a linearly rising electronic scattering background similar to observations in YBa2Cu3O7, possibly indicating a distribution of gaps or the presence of electronic excitations within the gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2Ca2Ba2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	105	Pressure not reported	onset
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
Bi2CaSr2Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	84	Pressure not reported	unknown