Abstract
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.
Original language | English |
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Article number | 092504 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 84 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2011 Sep 14 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics