التفاصيل البيبلوغرافية
| العنوان: |
Competing soft phonon modes at the charge-density-wave transitions in DyTe$_3$ |
| المؤلفون: |
Maschek, M., Zocco, D. A., Rosenkranz, S., Heid, R., Said, A. H., Alatas, A., Walmsley, P., Fisher, I. R., Weber, F. |
| المصدر: |
Phys. Rev. B 98, 094304 (2018) |
| سنة النشر: |
2018 |
| المجموعة: |
Condensed Matter |
| مصطلحات موضوعية: |
Condensed Matter - Materials Science |
| الوصف: |
The family of rare-earth tritellurides RTe$_3$ features charge-density-wave (CDW) order related to strongly momentum-dependent electron-phonon coupling. Similar to other CDW compounds, superconductivity is observed when the CDW order is suppressed via hydrostatic pressure [1]. What sets the heavier members of the RTe3 series apart is the observation of a second CDW transition at lower temperatures having an in-plane ordering wavevector $q_{CDW,2}\parallel [100]$ of almost the same magnitude but orthogonal to the ordering wavevector $q_{CDW,1}\parallel [001]$ observed at higher temperatures [2]. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of DyTe$_3$. In particular, we show that there are several phonon modes along both in-plane directions, which respond to the onset of the CDW transition at $T_{CDW,1}=308\,\rm{K}$. Surprisingly, these soft modes close to $q_{CDW,2}=(0.68,0,0)$ show strong softening near $T_{CDW,1}$ but do not exhibit any response to the lower-temperature transition at $T_{CDW,2}=68\,\rm{K}$. Our results indicate that the low-temperature CDW order is not just the 90{\deg} rotated analogue of the one appearing at high temperatures. |
| نوع الوثيقة: |
Working Paper |
| DOI: |
10.1103/PhysRevB.98.094304 |
| URL الوصول: |
http://arxiv.org/abs/1805.07198 |
| رقم الانضمام: |
edsarx.1805.07198 |
| قاعدة البيانات: |
arXiv |