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

doi:10.1103/PhysRevMaterials.3.034802

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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Abstract

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.

Original language	English
Article number	034802
Journal	Physical Review Materials
Volume	3
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevMaterials.3.034802
State	Published - 25 Mar 2019

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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. (2019). 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. Physical Review Materials, 3(3), [034802]. https://doi.org/10.1103/PhysRevMaterials.3.034802

@article{f6d773bde99c44d08624459760b0a1d3,

title = "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",

abstract = "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.",

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

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = mar,

day = "25",

doi = "10.1103/PhysRevMaterials.3.034802",

language = "English",

volume = "3",

journal = "Physical Review Materials",

issn = "2475-9953",

publisher = "American Physical Society",

number = "3",

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Cheng, PC, Tzeng, WY, Chu, YJ, Luo, C-W, Zhukov, AA, Whittaker, J, Lin, J-Y, Wu, K-H, Juang, J-Y, Liu, M, Morozov, IV, Boltalin, AI & Vasiliev, AN 2019, '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', Physical Review Materials, vol. 3, no. 3, 034802. https://doi.org/10.1103/PhysRevMaterials.3.034802

TY - JOUR

T1 - 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

AU - Cheng, P. C.

AU - Tzeng, W. Y.

AU - Chu, Y. J.

AU - Luo, Chih-Wei

AU - Zhukov, A. A.

AU - Whittaker, J.

AU - Lin, Jiunn-Yuan

AU - Wu, Kaung-Hsiung

AU - Juang, Jenh-Yih

AU - Liu, M.

AU - Morozov, I. V.

AU - Boltalin, A. I.

AU - Vasiliev, A. N.

PY - 2019/3/25

Y1 - 2019/3/25

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevMaterials.3.034802

DO - 10.1103/PhysRevMaterials.3.034802

M3 - Article

AN - SCOPUS:85064182501

SN - 2475-9953

VL - 3

JO - Physical Review Materials

JF - Physical Review Materials

IS - 3

M1 - 034802

ER -

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

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