Phonon anomalies in some iron telluride materials

Dai, Y. M.; Schneeloch, J.; Zhong, R. D.; Gu, G. D.

doi:10.1103/PhysRevB.93.125135

Title: Phonon anomalies in some iron telluride materials

Journal Article · Mon Mar 21 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.125135· OSTI ID:1255725

Dai, Y. M. ^[1]; Schneeloch, J. ^[1]; Zhong, R. D. ^[1]; Gu, G. D. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

In this paper, the detailed temperature dependence of the infrared-active mode in Fe_1.03Te (T_N ≃ 68 K) and Fe_1.13Te (T_N ≃ 56 K) has been examined, and the position, width, strength, and asymmetry parameter have been determined using an asymmetric Fano profile superimposed on an electronic background. In both materials the frequency of the mode increases as the temperature is reduced; however, there is also a slight asymmetry in the line shape, indicating that the mode is coupled to either spin or charge excitations. Below T_N there is an anomalous decrease in frequency, and the mode shows little temperature dependence, at the same time becoming more symmetric, suggesting a reduction in spin- or electron-phonon coupling. The frequency of the infrared-active mode and the magnitude of the shift below T_N are predicted reasonably well by first-principles calculations; however, the predicted splitting of the mode is not observed. In superconducting FeTe_0.55Se_0.45 (T_c ≃ 14 K) the infrared-active E_u mode displays asymmetric line shape at all temperatures, which is most pronounced between 100 – 200 K, indicating the presence of either spin- or electron-phonon coupling, which may be a necessary prerequisite for superconductivity in this class of materials.

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Research Organization:: Brookhaven National Lab. (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

OSTI ID:: 1255725

Alternate ID(s):: OSTI ID: 1242847

Report Number(s):: BNL-112206-2016-JA; PRBMDO; R&D Project: PO016; PO010; KC0202020; KC0201060

Journal Information:: Physical Review B, Vol. 93, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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