Effects of electron-phonon coupling on the metal-insulator transition in La2−xSrxCuO4 superconductors

Changjin Zhang; Yuheng Zhang

doi:10.1103/PhysRevB.67.153107

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Effects of electron-phonon coupling on the metal-insulator transition in La2−xSrxCuO4 superconductors

Changjin Zhang, Yuheng Zhang

DOI 10.1103/PhysRevB.67.153107 · Physical Review B

T1

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Abstract

We have studied the infrared spectroscopies and the resistivity of the La1.85−xPrxSr0.15CuO4 samples, La1.85−2xSr0.15+2xCu1−xMnxO4 samples, and La1.85Sr0.15Cu1−xMgxO4 samples. Two infrared transmission peaks of ν1=513cm−1 and ν2=683cm−1 are identified to be those of the c-axis stretching mode and the in plane Cu-O stretching mode. The experimental results indicate that the appearance of the ν2 peak is always along with the metal-insulator transition. We suggest that the coupling of the ν2 mode phonon with hole carrier leads to an extra energy gap, which is the origin of the metal-insulator transition in La2−xSrxCuO4 superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.85-xPrxSr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.85-2xSr0.15+2xCu1-xMnxO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.85Sr0.15Cu1-xMgxO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown