Journal
NEW JOURNAL OF PHYSICS
Volume 14, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/14/10/103053
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Funding
- National Science Council [NSC 98-2112-M-009-008-MY3]
- Ministry of Education (the MOE-ATU plan at National Chiao Tung University)
- Russian Ministry of Science and Education [11.519.11.6012, 14.740.11.1365]
- Russian Foundation for Basic Research [10-02-00021, 12-02-90405, 12-02-90823]
- Russian Federation for State Support of Young Russian Scientists [MK-1557.2011.5]
- Russian Ministry of Education and Science [N83-78]
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The ultrafast quasiparticle dynamics of Fe1+ySe1-xTex single crystals were investigated by dual-color transient reflectivity measurements (Delta R/R) from 4.3 to 290 K. The electron-phonon coupling strength lambda (= 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 Delta R/R. Such a small lambda demonstrates the unconventional origin of superconductivity in FeSe. Moreover, the temperature-dependent Delta R/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.
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