Raman scattering study of electron-doped PrxCa 1-xFe2As2 superconductors

A. P. Litvinchuk; Bing Lv; C. W. Chu

doi:10.1103/PhysRevB.84.092504

Raman scattering study of electron-doped Pr_xCa _1-xFe₂As₂ superconductors

A. P. Litvinchuk, Bing Lv, C. W. Chu

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Research output: Contribution to journal › Article › peer-review

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Abstract

Temperature-dependent polarized Raman spectra of electron-doped superconducting Pr_xCa_1-xFe₂As₂ (0.12) single crystals are reported. All four even-parity phonons allowed by symmetry are identified. The phonon mode of B_1g symmetry at 222 cm^-1, which is associated with the c-axis motion of Fe ions, is found to exhibit an anomalous frequency hardening at low temperatures, that signals nonvanishing electron-phonon coupling in the superconducting state and implies that the superconducting gap magnitude 2Δ_c<27 meV.

Original language	English
Article number	092504
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	84
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.84.092504
Publication status	Published - 2011 Sep 14

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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N2 - Temperature-dependent polarized Raman spectra of electron-doped superconducting PrxCa1-xFe2As2 (0.12) single crystals are reported. All four even-parity phonons allowed by symmetry are identified. The phonon mode of B1g symmetry at 222 cm-1, which is associated with the c-axis motion of Fe ions, is found to exhibit an anomalous frequency hardening at low temperatures, that signals nonvanishing electron-phonon coupling in the superconducting state and implies that the superconducting gap magnitude 2Δc<27 meV.

AB - Temperature-dependent polarized Raman spectra of electron-doped superconducting PrxCa1-xFe2As2 (0.12) single crystals are reported. All four even-parity phonons allowed by symmetry are identified. The phonon mode of B1g symmetry at 222 cm-1, which is associated with the c-axis motion of Fe ions, is found to exhibit an anomalous frequency hardening at low temperatures, that signals nonvanishing electron-phonon coupling in the superconducting state and implies that the superconducting gap magnitude 2Δc<27 meV.

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Raman scattering study of electron-doped Pr_xCa _1-xFe₂As₂ superconductors

Abstract

All Science Journal Classification (ASJC) codes

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