Phonon, Two-Magnon and Electronic Raman Scattering of Fe1+yTe1-xSex

Details Phonon, Two-Magnon and Electronic Raman Scattering of Fe1+yTe1-xSex Phonon, Two-Magnon and Electronic Raman Scattering of Fe1+yTe1-xSex

2010-10-12

arxiv.org/abs/1010.2374v2

Phys. Rev. B 83, 035103 (2011)

Physics

Condensed Matter

Superconductivity

8 pages, 8 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.83.035103

We have measured Raman scattering spectra of single-crystalline FeTe0.6Se0.4 (T_c ~ 14.5 K) and its parent compound Fe1.074Te at various temperatures. In the parent compound Fe1.074Te, A1g and B1g modes have been observed at 157.5 and 202.3 cm-1, respectively, at 5 K. These frequencies qualitatively agree with the calculated results. Two-magnon excitation has been observed around 2300 cm-1 for both compounds. Temperature dependence between the electronic Raman spectra below and above T_c has been observed and 2\Delta and 2\Delta/k_BT_C have been estimated as 5.0 meV and 4.0, respectively.

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