Raman spectroscopy of KxCo2-ySe2 single crystals near the ferromagnet-paramagnet transition

Opacic, M.; Lazarevic, N.; Radonjic, M. M.; Scepanovic, M.; Ryu, Hyejin; Wang, Aifeng; Tanaskovic, D.; Petrovic, C.; Popovic, Z. V.

doi:10.1088/0953-8984/28/48/485401

Title: Raman spectroscopy of KxCo2-ySe2 single crystals near the ferromagnet-paramagnet transition

Journal Article · 05 October 2016 · Journal of Physics. Condensed Matter

DOI: https://doi.org/10.1088/0953-8984/28/48/485401 · OSTI ID:1341609

Opacic, M. ^[1]; Lazarevic, N. ^[1]; Radonjic, M. M. ^[2]; Scepanovic, M. ^[1]; Ryu, Hyejin ^[3]; Wang, Aifeng ^[4]; Tanaskovic, D. ^[1]; Petrovic, C. ^[3]; Popovic, Z. V. ^[1]

Univ. of Belgrade (Serbia)
Univ. of Augsburg (Germany); Univ. of Belgrade (Serbia)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Polarized Raman scattering spectra of the K_xCo_2-ySe₂ (x = :::; y = :::) single crystals reveal the presence of two phonon modes, assigned as of the A1g and B1g symmetry. Absence of additional modes excludes the possibility of vacancy ordering, unlike in K_xCo_2-ySe₂ . The ferromagnetic (FM) phase transition at Tc 74 K leaves a clear fingerprint on the temperature dependence of the Raman mode energy and linewidth. For T > Tc the temperature dependence looks conventional, driven by the thermal expansion and anharmonicity. The Raman modes are rather broad due to the electron-phonon coupling increased by the disorder and spin fluctuation e ects. In the FM phase the phonon frequency of both modes increases, while an opposite trend is seen in their linewidth: the A1g mode narrows in the FM phase, whereas the B_1g mode broadens. We argue that the large asymmetry and anomalous frequency shift of the B_1g mode is due to the coupling of spin fluctuations and vibration. Our density functional theory (DFT) calculations for the phonon frequencies agree rather well with the Raman measurements, with some discrepancy being expected since the DFT calculations neglect the spin fluctuations.

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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:: SC0012704; AC02-98CH10886

OSTI ID:: 1341609

Report Number(s):: BNL-113329-2016-JA; R&D Project: PM016; KC0201050; TRN: US1701571

Journal Information:: Journal of Physics. Condensed Matter, Vol. 28, 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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