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.
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Part of this research project has been supported by the European Commission under the 7th Framework Programme Marie Curie action SOPRANO project (Grant No. PITNGA-2008-214040), and by the German Science Foundation under SFB/TRR 80. We are grateful to A. Frano and P. Wochner for discussions and technical assistance.
The authors declare no competing financial interests.
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Driza, N., Blanco-Canosa, S., Bakr, M. et al. Long-range transfer of electron–phonon coupling in oxide superlattices. Nature Mater 11, 675–681 (2012). https://doi.org/10.1038/nmat3378
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