Investigation of the Superconducting Gap in La2−xSrxCuO4 by Raman Spectroscopy

X. K. Chen; J. C. Irwin; H. J. Trodahl; T. Kimura; K. Kishio

doi:10.1103/PhysRevLett.73.3290

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Investigation of the Superconducting Gap in La2−xSrxCuO4 by Raman Spectroscopy

X. K. Chen, J. C. Irwin, H. J. Trodahl, T. Kimura, K. Kishio

DOI 10.1103/PhysRevLett.73.3290 · Physical Review Letters

T1

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Abstract

The low energy Raman spectra of a La1.83Sr.17CuO4 single crystal have been measured at temperatures above and below Tc. The redistribution of the electronic continua that occurs as a result of the opening of the superconducting gap has been observed. Based on the polarization dependence of the continua, it is concluded that the superconducting gap Δ(k) is anisotropic, with nodes along the (±1, ±1) directions and maxima along the (0, ±1) and (±1, 0) directions. The maximum pairing energy 2|Δmax| is estimated to be about 7.7kTc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.83Sr0.17CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown