標題: 3D visualizations of nanoscale phase separation and ultrafast dynamic correlation between phases in (Na0.32K0.68)(0.95)Fe1.75Se2
作者: Cheng, P. C.
Tzeng, W. Y.
Chu, Y. J.
Luo, C. W.
Zhukov, A. A.
Whittaker, J.
Lin, J-Y
Wu, K. H.
Juang, J. Y.
Liu, M.
Morozov, I., V
Boltalin, A., I
Vasiliev, A. N.
交大名義發表
電子物理學系
物理研究所
National Chiao Tung University
Department of Electrophysics
Institute of Physics
公開日期: 25-Mar-2019
摘要: Phase separation of metallic and antiferromagnetic (AFM) insulating phases in alkaline iron selenides (A(x)Fe(2)-ySe(2)) continues to attract intense interest because the relationship between two peculiar features probably is a key to clarifying the pairing mechanism of A(x)Fe(2-y)Se(2) superconductors. Here we report that the three-dimensional (3D) visualizations of nanoscale phase separation in (Na0.32K0.68)(0.95)Fe1.75Se2 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)(0.95)Fe1.75Se2 is studied by dual-color pump-probe spectroscopy. The anomalous changes in the electron and acoustic phonon components of transient reflectivity change (Delta R/R) identify two characteristic temperatures T* similar to 100K (the onset temperature of coupling between the nanometallic and AFM phases) and T-H similar to 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.
URI: http://dx.doi.org/10.1103/PhysRevMaterials.3.034802
http://hdl.handle.net/11536/151663
ISSN: 2475-9953
DOI: 10.1103/PhysRevMaterials.3.034802
期刊: PHYSICAL REVIEW MATERIALS
Volume: 3
Issue: 3
起始頁: 0
結束頁: 0
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