Anomalous phonon behavior in superconducting CaKFe4As4: An optical study

Yang, Run; Dai, Yaomin; Xu, Bing; Zhang, Wei; Qiu, Ziyang; Sui, Qiangtao; Homes, Christopher C.; Qiu, Xianggang

doi:10.1103/PhysRevB.95.064506

Title: Anomalous phonon behavior in superconducting ${CaKFe}_{4} {As}_{4}$ : An optical study

Journal Article · Wed Feb 08 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.064506· OSTI ID:1345727

Yang, Run ^[1]; Dai, Yaomin ^[2]; Xu, Bing ^[3]; Zhang, Wei ^[4]; Qiu, Ziyang ^[4]; Sui, Qiangtao ^[4]; Homes, Christopher C. ^[2]; Qiu, Xianggang ^[5]

Chinese Academy of Sciences (CAS), Beijing (China); Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Center for High Pressure Science and Technology Advanced Research, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

Here, the temperature dependence of ab-plane optical conductivity of CaKFe₄As₄ has been measured below and above its superconducting transition temperature T_c≃35.5 K. In the normal state, analysis with the two-Drude model reveals a T-linear scattering rate for the coherent response, which suggests strong spin-fluctuation scattering. Below the superconducting transition, the optical conductivity below 120 cm^–1 vanishes, indicating nodeless gap(s). The Mattis-Bardeen fitting in the superconducting state gives two gaps of Δ₁ ≃ 9 meV and Δ₂ ≃ 14 meV, in good agreement with recent angle-resolved photoemission spectroscopy (ARPES) results. In addition, around 255 cm^–1, we observe two different infrared-active Fe-As modes with obvious asymmetric lineshape, originating from strong coupling between lattice vibrations and spin or charge excitations. Considering a moderate Hund's rule coupling determined from spectral weight analysis, we propose that the strong fluctuations induced by the coupling between itinerant carriers and local moments may affect the phonon mode, and the electron-phonon coupling through the spin channel is likely to play an important role in the unconventional pairing in iron-based superconductors.

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

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

Grant/Contract Number:: SC00112704; SC0012704

OSTI ID:: 1345727

Alternate ID(s):: OSTI ID: 1343337

Report Number(s):: BNL-113510-2017-JA; PRBMDO; R&D Project: PO016; KC0202020; TRN: US1700873

Journal Information:: Physical Review B, Vol. 95, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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