تقرير
Quasiparticle dynamics and phonon softening in FeSe superconductors
| العنوان: | Quasiparticle dynamics and phonon softening in FeSe superconductors |
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| المؤلفون: | Luo, C. W., Wu, I. H., Cheng, P. C., Lin, J-Y, Wu, K. H., Uen, T. M., Juang, J. Y., Kobayashi, T., Chareev, D. A., Volkova, O. S., Vasiliev, A. N. |
| المصدر: | Physical Review Letters Vol. 108, 257006 (2012) |
| سنة النشر: | 2012 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Quasiparticle dynamics of FeSe single crystals revealed by dual-color transient reflectivity measurements ({\Delta}R/R) provides unprecedented information on Fe-based superconductors. The amplitude of fast component in {\Delta}R/R clearly tells a competing scenario between spin fluctuations and superconductivity. Together with the transport measurements, the relaxation time analysis further exhibits anomalous changes at 90 K and 230 K. The former manifests a structure phase transition as well as the associated phonon softening. The latter suggests a previously overlooked phase transition or crossover in FeSe. The electron-phonon coupling constant {\lambda} is found to be 0.16, identical to the value of theoretical calculations. Such a small {\lambda} demonstrates an unconventional origin of superconductivity in FeSe. Comment: Final published version; 5 pages; 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.108.257006 |
| الوصول الحر: | http://arxiv.org/abs/1201.1167Test |
| رقم الانضمام: | edsarx.1201.1167 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.108.257006 |
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