title: Quasi-particle interference of heavy fermions in resonant x-ray scattering.
abstract: 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 CeMIn5(M= Co, Rh). Temperature- and doping-dependent RXS measurements at the Ce-M4edge show a broad scattering enhancement that correlates with the appearance of heavyf-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.
authors.affiliation: Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ 08544, USA.
authors.forename: András
authors.initials: A
authors.lastname: Gyenis
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.; Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.; Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.; Quantum Materials Program, Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada.
authors.forename: Eduardo H
authors.initials: EH
authors.lastname: da Silva Neto
authors.affiliation: Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada.
authors.forename: Ronny
authors.identifier: 0000-0002-1969-3690
authors.initials: R
authors.lastname: Sutarto
authors.affiliation: Helmholtz-Zentrum Berlin fürMaterialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany.
authors.forename: Enrico
authors.initials: E
authors.lastname: Schierle
authors.affiliation: Helmholtz-Zentrum Berlin fürMaterialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany.
authors.forename: Feizhou
authors.identifier: 0000-0002-3125-1406
authors.initials: F
authors.lastname: He
authors.affiliation: Helmholtz-Zentrum Berlin fürMaterialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany.
authors.forename: Eugen
authors.initials: E
authors.lastname: Weschke
authors.affiliation: Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, NY 13902, USA.
authors.forename: Mariam
authors.identifier: 0000-0002-2872-0814
authors.initials: M
authors.lastname: Kavai
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Ryan E
authors.identifier: 0000-0002-6314-3629
authors.initials: RE
authors.lastname: Baumbach
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Joe D
authors.initials: JD
authors.lastname: Thompson
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Eric D
authors.initials: ED
authors.lastname: Bauer
authors.affiliation: Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697, USA.
authors.forename: Zachary
authors.initials: Z
authors.lastname: Fisk
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.; Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Andrea
authors.initials: A
authors.lastname: Damascelli
authors.affiliation: Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ 08544, USA.
authors.forename: Ali
authors.identifier: 0000-0003-4996-8904
authors.initials: A
authors.lastname: Yazdani
authors.affiliation: Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, NY 13902, USA.
authors.forename: Pegor
authors.initials: P
authors.lastname: Aynajian
keywords: Resonant x-ray scattering (RXS); heavy fermions; quasiparticle interference; scanning tunneling microscopy (STM); strongly correlated electron systems