期刊
PHYSICAL REVIEW B
卷 84, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.092504
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资金
- T.L.L. Temple Foundation
- J. J. and R. Moores Endowment
- State of Texas through TCSUH
- USAF Office of Scientific Research
- LBNL through the USDOE
Temperature-dependent polarized Raman spectra of electron-doped superconducting PrxCa1-xFe2As2 (x approximate to 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 2 Delta(c) < 27 meV.
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