Evidence of superconductivity-induced phonon spectra renormalization in alkali-doped iron selenides

Opačić, M.; Lazarević, N.; Šćepanović, M.; Ryu, Hyejin; Lei, Hechang; Petrovic, C.; Popović, Z. V.

doi:10.1088/0953-8984/27/48/485701

Title: Evidence of superconductivity-induced phonon spectra renormalization in alkali-doped iron selenides

Journal Article · Mon Nov 16 00:00:00 EST 2015 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/27/48/485701· OSTI ID:1240587

Opačić, M. ^[1]; Lazarević, N. ^[1]; Šćepanović, M. ^[1]; Ryu, Hyejin ^[2]; Lei, Hechang ^[3]; Petrovic, C. ^[2]; Popović, Z. V. ^[1]

Univ. of Belgrade, Belgrade (Serbia). Institute of Physics Belgrade
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

Polarized Raman scattering spectra of superconducting K_xFe_2-ySe₂ and nonsuperconducting K_0.8Fe_1.8Co_0.2Se₂ single crystals were measured in a temperature range from 10 K up to 300 K. Two Raman active modes from the I4/mmm phase and seven from the I4/m phase are observed in frequency range from 150 to 325 cm ^-1 in both compounds, suggesting that K_0.8Fe_1.8Co_0.2Se₂ single crystal also has two-phase nature. Temperature dependence of Raman mode energy is analyzed in terms of lattice thermal expansion and phonon-phonon interaction. Temperature dependence of Raman mode linewidth is considered as temperature-induced anharmonic effects. It is shown that change of Raman mode energy with temperature is dominantly driven by thermal expansion of the crystal lattice. Abrupt change of the A_1g mode energy near T_C was observed in K_xFe_2-ySe₂ , whereas it is absent in K_0.8Fe_1.8Co_0.2Se₂. Phonon energy hardening at low temperatures in the superconducting sample is a consequence of superconductivity-induced redistribution of the electronic states below critical temperature.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; Ac02-98CH10886

OSTI ID:: 1240587

Report Number(s):: BNL-111746-2016-JA; R&D Project: PM016; KC0201050

Journal Information:: Journal of Physics. Condensed Matter, Vol. 27, Issue 48; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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