تقرير
Pressure-induced order-disorder phase transition in superconducting CaC6
| العنوان: | Pressure-induced order-disorder phase transition in superconducting CaC6 |
|---|---|
| المؤلفون: | Gauzzi, A., Bendiab, N., d'Astuto, M., Canny, B., Calandra, M., Mauri, F., Loupias, G., Emery, N., Herold, C., Lagrange, P., Hanfland, M., Mezouar, M. |
| سنة النشر: | 2008 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Materials Science |
| الوصف: | By means of synchrotron X-ray diffraction, we studied the effect of high pressure, P, up to 13 GPa on the room temperature crystal structure of superconducting CaC6. In this P range, no change of the pristine space group symmetry, \textit{R\=3m}, is found. However, at 9 GPa, i.e. close to the critical value at which a large T_c reduction was reported recently, we observed a compressibility jump concomitant to a large broadening of Bragg peaks. The reversibility of both effects upon depressurization and symmetry arguments give evidence of an order-disorder phase transition of second order, presumably associated with the Ca sublattice, which provides a full account for the above Tc reduction. Comment: 9 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/0802.3273 |
| رقم الأكسشن: | edsarx.0802.3273 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |