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Quasi-particle interference of heavy fermions in resonant x-ray scattering

Resonant x-ray scattering (RXS) has recently become an increasingly important tool for the study of ordering phenomena in correlated electron systems. Yet, the interpretation of RXS experiments remains theoretically challenging because of the complexity of the RXS cross section. Central to this deba...

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Detalles Bibliográficos
Autores principales: Gyenis, András, da Silva Neto, Eduardo H., Sutarto, Ronny, Schierle, Enrico, He, Feizhou, Weschke, Eugen, Kavai, Mariam, Baumbach, Ryan E., Thompson, Joe D., Bauer, Eric D., Fisk, Zachary, Damascelli, Andrea, Yazdani, Ali, Aynajian, Pegor
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5065254/
https://www.ncbi.nlm.nih.gov/pubmed/27757422
http://dx.doi.org/10.1126/sciadv.1601086
Descripción
Sumario:Resonant x-ray scattering (RXS) has recently become an increasingly important tool for the study of ordering phenomena in correlated electron systems. Yet, the interpretation of RXS experiments remains theoretically challenging because of the complexity of the RXS cross section. Central to this debate is the recent proposal that impurity-induced Friedel oscillations, akin to quasi-particle interference signals observed with a scanning tunneling microscope (STM), can lead to scattering peaks in RXS experiments. The possibility that quasi-particle properties can be probed in RXS measurements opens up a new avenue to study the bulk band structure of materials with the orbital and element selectivity provided by RXS. We test these ideas by combining RXS and STM measurements of the heavy fermion compound CeMIn(5) (M = Co, Rh). Temperature- and doping-dependent RXS measurements at the Ce-M(4) edge show a broad scattering enhancement that correlates with the appearance of heavy f-electron bands in these compounds. The scattering enhancement is consistent with the measured quasi-particle interference signal in the STM measurements, indicating that the quasi-particle interference can be probed through the momentum distribution of RXS signals. Overall, our experiments demonstrate new opportunities for studies of correlated electronic systems using the RXS technique.