3D visualizations of nanoscale phase separation and ultrafast dynamic correlation between phases in (N a0.32 K0.68)0.95 F e1.75 S e2

P. C. Cheng, W. Y. Tzeng, Y. J. Chu, Chih-Wei Luo, A. A. Zhukov, J. Whittaker, Jiunn-Yuan Lin, Kaung-Hsiung Wu, Jenh-Yih Juang, M. Liu, I. V. Morozov, A. I. Boltalin, A. N. Vasiliev

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    1 引文 斯高帕斯(Scopus)

    摘要

    Phase separation of metallic and antiferromagnetic (AFM) insulating phases in alkaline iron selenides (AxFe2-ySe2) continues to attract intense interest because the relationship between two peculiar features probably is a key to clarifying the pairing mechanism of AxFe2-ySe2 superconductors. Here we report that the three-dimensional (3D) visualizations of nanoscale phase separation in (Na0.32K0.68)0.95Fe1.75Se2 single crystals are revealed by hybrid focused-ion-beam scanning electron microscopy and the superconducting paths are fully percolative in 3D. Moreover, the phase-related ultrafast dynamics in (Na0.32K0.68)0.95Fe1.75Se2 is studied by dual-color pump-probe spectroscopy. The anomalous changes in the electron and acoustic phonon components of transient reflectivity change (ΔR/R) identify two characteristic temperatures T∗∼100K (the onset temperature of coupling between the nanometallic and AFM phases) and TH∼230K (the onset temperature of the metallic-interface phase). An energy-transfer channel between the nanometallic and AFM phases is inferred. This proposed channel provides insight into the pairing mechanism of alkaline iron selenide superconductors.

    原文English
    文章編號034802
    期刊Physical Review Materials
    3
    發行號3
    DOIs
    出版狀態Published - 25 三月 2019

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