تقرير
Spin Dynamics at Very Low Temperature in Spin Ice Dy$_2$Ti$_2$O$_7$
| العنوان: | Spin Dynamics at Very Low Temperature in Spin Ice Dy$_2$Ti$_2$O$_7$ |
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| المؤلفون: | Matsuhira, K., Paulsen, C., Lhotel, E., Sekine, C., Hiroi, Z., Takagi, S. |
| المصدر: | J. Phys. Soc. Jap. 80 (2011), 123711 |
| سنة النشر: | 2012 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science |
| الوصف: | We have performed AC susceptibility and DC magnetic relaxation measurements on the spin ice system Dy$_2$Ti$_2$O$_7$ down to 0.08 K. The relaxation time of the magnetization has been estimated below 2 K down to 0.08 K. The spin dynamics of Dy$_2$Ti$_2$O$_7$ is well described by using two relaxation times ($\tau_{\rm S}$ (short time) and $\tau_{\rm L}$ (long time)). Both $\tau_{\rm S}$ and $\tau_{\rm L}$ increase on cooling. Assuming the Arrhenius law in the temperature range 0.5-1 K, we obtained an energy barrier of 9 K. Below 0.5 K, both $\tau_{\rm S}$ and $\tau_{\rm L}$ show a clear deviation from the thermal activated dynamics toward temperature independent relaxation, suggesting a quantum dynamics. Comment: 4 pages |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1143/JPSJ.80.123711 |
| URL الوصول: | http://arxiv.org/abs/1202.1107 |
| رقم الأكسشن: | edsarx.1202.1107 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1143/JPSJ.80.123711 |
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