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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

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.

Original language	English
Article number	103053
Number of pages	14
Journal	New Journal of Physics
Volume	14
DOIs	https://doi.org/10.1088/1367-2630/14/10/103053
State	Published - Oct 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, Article 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.",

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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 Fe_1+ySe _1-xTe_x single crystals

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