التفاصيل البيبلوغرافية
| العنوان: |
Giant Magnon Gap in Bilayer Iridate Sr3Ir2O7: Enhanced Pseudo-dipolar Interactions Near the Mott Transition |
| المؤلفون: |
Kim, Jungho, Said, A. H., Casa, D., Upton, M. H., Gog, T., Daghofer, M., Jackeli, G., Brink, J. van den, Khaliullin, G., Kim, B. J. |
| المصدر: |
Phys. Rev. Lett 109, 157402 (2012) |
| سنة النشر: |
2012 |
| المجموعة: |
Condensed Matter |
| مصطلحات موضوعية: |
Condensed Matter - Strongly Correlated Electrons |
| الوصف: |
Using resonant inelastic x-ray scattering, we observe in the bilayer iridate Sr3Ir2O7, a spin-orbit coupling driven magnetic insulator with a small charge gap, a magnon gap of ~92 meV for both acoustic and optical branches. This exceptionally large magnon gap exceeds the total magnon bandwidth of ~70 meV and implies a marked departure from the Heisenberg model, in stark contrast to the case of the single-layer iridate Sr2IrO4. Analyzing the origin of these observations, we find that the giant magnon gap results from bond-directional pseudo-dipolar interactions that are strongly enhanced near the metal-insulator transition boundary. This suggests that novel magnetism, such as that inspired by the Kitaev model built on the pseudo-dipolar interactions, may emerge in small charge-gap iridates. |
| نوع الوثيقة: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.109.157402 |
| URL الوصول: |
http://arxiv.org/abs/1205.5337 |
| رقم الانضمام: |
edsarx.1205.5337 |
| قاعدة البيانات: |
arXiv |