Report
Long-range transfer of electron-phonon coupling in oxide superlattices
| العنوان: | Long-range transfer of electron-phonon coupling in oxide superlattices |
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| المؤلفون: | Driza, N., Blanco-Canosa, S., Bakr, M., Soltan, S., Khalid, M., Mustafa, L., Kawashima, K., Christiani, G., Habermeier, H. -U., Khaliullin, G., Ulrich, C., Tacon, M. Le, Keimer, B. |
| المصدر: | Nature Materials 11, 675 (2012) |
| سنة النشر: | 2012 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science, Condensed Matter - Superconductivity |
| الوصف: | The electron-phonon interaction is of central importance for the electrical and thermal properties of solids, and its influence on superconductivity, colossal magnetoresistance, and other many-body phenomena in correlated-electron materials is currently the subject of intense research. However, the non-local nature of the interactions between valence electrons and lattice ions, often compounded by a plethora of vibrational modes, present formidable challenges for attempts to experimentally control and theoretically describe the physical properties of complex materials. Here we report a Raman scattering study of the lattice dynamics in superlattices of the high-temperature superconductor $\bf YBa_2 Cu_3 O_7$ and the colossal-magnetoresistance compound $\bf La_{2/3}Ca_{1/3}MnO_{3}$ that suggests a new approach to this problem. We find that a rotational mode of the MnO$_6$ octahedra in $\bf La_{2/3}Ca_{1/3}MnO_{3}$ experiences pronounced superconductivity-induced lineshape anomalies, which scale linearly with the thickness of the $\bf YBa_2 Cu_3 O_7$ layers over a remarkably long range of several tens of nanometers. The transfer of the electron-phonon coupling between superlattice layers can be understood as a consequence of long-range Coulomb forces in conjunction with an orbital reconstruction at the interface. The superlattice geometry thus provides new opportunities for controlled modification of the electron-phonon interaction in complex materials. Comment: 13 pages, 4 figures. Revised version to be published in Nature Materials |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/NMAT3378 |
| URL الوصول: | http://arxiv.org/abs/1206.2330 |
| رقم الانضمام: | edsarx.1206.2330 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/NMAT3378 |
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