تقرير
Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La$_{0.7}$Ca$_{0.3}$MnO$_3$
| العنوان: | Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La$_{0.7}$Ca$_{0.3}$MnO$_3$ |
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| المؤلفون: | Helton, Joel S., Jones, Susumu K., Parshall, Daniel, Stone, Matthew B., Shulyatev, Dmitry A., Lynn, Jeffrey W. |
| المصدر: | Physical Review B 96, 104417 (2017) |
| سنة النشر: | 2017 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | While the spin dynamics of La$_{0.7}$Ca$_{0.3}$MnO$_3$ in the ferromagnetic phase are known to be unconventional, previous measurements have yielded contradictory results regarding the damping of spin wave excitations. Neutron spectroscopy measurements on a sample with a transition temperature of $T_c$=257 K, higher than most single crystals, unambiguously reveal an anomalous increase in spin wave damping for excitations approaching the Brillouin zone boundary along the [$100$] direction that cannot be explained as an artifact due to a noninteracting phonon branch. Spin waves throughout the ($HK0$) plane display a common trend where the spin wave damping is dependent upon the excitation energy, increasing for energies above roughly 15 meV and reaching a full width at half maximum of at least 20 meV. The results are consistent with a model of intrinsic spatial inhomogeneity with phase separated regions approximately 18 {\AA} in size persisting over a large range of temperatures below $T_c$. Comment: v2: 8 pages, 7 figures v1: 7 pages, 7 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.96.104417 |
| URL الوصول: | http://arxiv.org/abs/1708.08960 |
| رقم الأكسشن: | edsarx.1708.08960 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.96.104417 |
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