Ultrafast dynamics and phonon softening in Fe1+ySe 1-xTex single crystals

Chih-Wei Luo; I. H. Wu; P. C. Cheng; Jiunn-Yuan Lin; Kaung-Hsiung Wu; T. M. Uen; Jenh-Yih Juang; T. Kobayashi; Y. C. Wen; T. W. Huang; K. W. Yeh; M. K. Wu; D. A. Chareev; O. S. Volkova; A. N. Vasiliev

doi:10.1088/1367-2630/14/10/103053

Ultrafast dynamics and phonon softening in Fe_1+ySe _1-xTe_x single crystals

Chih-Wei Luo^*, I. H. Wu, P. C. Cheng, Jiunn-Yuan Lin, Kaung-Hsiung Wu, T. M. Uen, Jenh-Yih Juang, T. Kobayashi, Y. C. Wen, T. W. Huang, K. W. Yeh, M. K. Wu, D. A. Chareev, O. S. Volkova, A. N. Vasiliev

^*此作品的通信作者

研究成果: Article › 同行評審

24 引文斯高帕斯（Scopus）

摘要

The ultrafast quasiparticle dynamics of Fe_1+ySe _1-xTe_x single crystals were investigated by dual-color transient reflectivity measurements (ΔR/R) from 4.3 to 290 K. The electron-phonon coupling strength λ (= 0.16-0.01) and the temperature-dependent energy of longitudinal-acoustic phonons were, respectively, obtained from the relaxation time of a fast component and the period of an oscillation component in ΔR/R. Such a small λ demonstrates the unconventional origin of superconductivity in FeSe. Moreover, the temperature-dependent ΔR/R exhibits anomalous changes at T _c, 90 K and 230 K, unambiguously revealing the phase transition as well as the phonon softening via the magnetoelastic effect.

原文	English
文章編號	103053
頁數	14
期刊	New Journal of Physics
卷	14
DOIs	https://doi.org/10.1088/1367-2630/14/10/103053
出版狀態	Published - 10月 2012

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Luo, C.-W., Wu, I. H., Cheng, P. C., Lin, J.-Y., Wu, K.-H., Uen, T. M., Juang, J.-Y., Kobayashi, T., Wen, Y. C., Huang, T. W., Yeh, K. W., Wu, M. K., Chareev, D. A., Volkova, O. S., & Vasiliev, A. N. (2012). Ultrafast dynamics and phonon softening in Fe_1+ySe _1-xTe_x single crystals. New Journal of Physics, 14, 文章 103053. https://doi.org/10.1088/1367-2630/14/10/103053

@article{96e1c4cca96045a8bfb65052e287ec53,

title = "Ultrafast dynamics and phonon softening in Fe1+ySe 1-xTex single crystals",

abstract = "The ultrafast quasiparticle dynamics of Fe1+ySe 1-xTex single crystals were investigated by dual-color transient reflectivity measurements (ΔR/R) from 4.3 to 290 K. The electron-phonon coupling strength λ (= 0.16-0.01) and the temperature-dependent energy of longitudinal-acoustic phonons were, respectively, obtained from the relaxation time of a fast component and the period of an oscillation component in ΔR/R. Such a small λ demonstrates the unconventional origin of superconductivity in FeSe. Moreover, the temperature-dependent ΔR/R exhibits anomalous changes at T c, 90 K and 230 K, unambiguously revealing the phase transition as well as the phonon softening via the magnetoelastic effect.",

author = "Chih-Wei Luo and Wu, {I. H.} and Cheng, {P. C.} and Jiunn-Yuan Lin and Kaung-Hsiung Wu and Uen, {T. M.} and Jenh-Yih Juang and T. Kobayashi and Wen, {Y. C.} and Huang, {T. W.} and Yeh, {K. W.} and Wu, {M. K.} and Chareev, {D. A.} and Volkova, {O. S.} and Vasiliev, {A. N.}",

year = "2012",

month = oct,

doi = "10.1088/1367-2630/14/10/103053",

language = "English",

volume = "14",

journal = "New Journal of Physics",

issn = "1367-2630",

publisher = "IOP Publishing Ltd.",

}

TY - JOUR

T1 - Ultrafast dynamics and phonon softening in Fe1+ySe 1-xTex single crystals

AU - Luo, Chih-Wei

AU - Wu, I. H.

AU - Cheng, P. C.

AU - Lin, Jiunn-Yuan

AU - Wu, Kaung-Hsiung

AU - Uen, T. M.

AU - Juang, Jenh-Yih

AU - Kobayashi, T.

AU - Wen, Y. C.

AU - Huang, T. W.

AU - Yeh, K. W.

AU - Wu, M. K.

AU - Chareev, D. A.

AU - Volkova, O. S.

AU - Vasiliev, A. N.

PY - 2012/10

Y1 - 2012/10

N2 - The ultrafast quasiparticle dynamics of Fe1+ySe 1-xTex single crystals were investigated by dual-color transient reflectivity measurements (ΔR/R) from 4.3 to 290 K. The electron-phonon coupling strength λ (= 0.16-0.01) and the temperature-dependent energy of longitudinal-acoustic phonons were, respectively, obtained from the relaxation time of a fast component and the period of an oscillation component in ΔR/R. Such a small λ demonstrates the unconventional origin of superconductivity in FeSe. Moreover, the temperature-dependent ΔR/R exhibits anomalous changes at T c, 90 K and 230 K, unambiguously revealing the phase transition as well as the phonon softening via the magnetoelastic effect.

AB - The ultrafast quasiparticle dynamics of Fe1+ySe 1-xTex single crystals were investigated by dual-color transient reflectivity measurements (ΔR/R) from 4.3 to 290 K. The electron-phonon coupling strength λ (= 0.16-0.01) and the temperature-dependent energy of longitudinal-acoustic phonons were, respectively, obtained from the relaxation time of a fast component and the period of an oscillation component in ΔR/R. Such a small λ demonstrates the unconventional origin of superconductivity in FeSe. Moreover, the temperature-dependent ΔR/R exhibits anomalous changes at T c, 90 K and 230 K, unambiguously revealing the phase transition as well as the phonon softening via the magnetoelastic effect.

UR - http://www.scopus.com/inward/record.url?scp=84869191149&partnerID=8YFLogxK

U2 - 10.1088/1367-2630/14/10/103053

DO - 10.1088/1367-2630/14/10/103053

M3 - Article

AN - SCOPUS:84869191149

SN - 1367-2630

VL - 14

JO - New Journal of Physics

JF - New Journal of Physics

M1 - 103053

ER -

Ultrafast dynamics and phonon softening in Fe1+ySe 1-xTex single crystals

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Ultrafast dynamics and phonon softening in Fe_1+ySe _1-xTe_x single crystals