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- Title
Long-range transfer of electron-phonon coupling in oxide superlattices.
- Authors
Driza, N.; Blanco-Canosa, S.; Bakr, M.; Soltan, S.; Khalid, M.; Mustafa, L.; Kawashima, K.; Christiani, G.; Habermeier, H-U.; Khaliullin, G.; Ulrich, C.; Le Tacon, M.; Keimer, B.
- Abstract
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 the subject of intense research at present. However, the non-local nature of the interactions between valence electrons and lattice ions, often compounded by a plethora of vibrational modes, presents 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 YBa2Cu3O7 (YBCO) and the colossal-magnetoresistance compound La2/3Ca1/3MnO3 that suggests a new approach to this problem. We find that a rotational mode of the MnO6 octahedra in La2/3Ca1/3MnO3 experiences pronounced superconductivity-induced line-shape anomalies, which scale linearly with the thickness of the YBCO layers over a remarkably long range of several tens of nanometres. 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.
- Subjects
PHONONS; ELECTRONS; SUPERLATTICES; OXIDES; MAGNETORESISTANCE; SUPERCONDUCTIVITY; CONDUCTION electrons; THERMAL properties
- Publication
Nature Materials, 2012, Vol 11, Issue 8, p675
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat3378