title: Pressure-Resistant Intermediate Valence in the Kondo Insulator SmB_{6}.
abstract: Resonant x-ray emission spectroscopy was used to determine the pressure dependence of the f-electron occupancy in the Kondo insulator SmB_{6}. Applied pressure reduces the f occupancy, but surprisingly, the material maintains a significant divalent character up to a pressure of at least 35 GPa. Thus, the closure of the resistive activation energy gap and onset of magnetic order are not driven by stabilization of an integer valent state. Over the entire pressure range, the material maintains a remarkably stable intermediate valence that can in principle support a nontrivial band structure.
authors.affiliation: Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, Maryland 20742, USA.|NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.|Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: Nicholas P
authors.initials: NP
authors.lastname: Butch
authors.affiliation: Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Johnpierre
authors.initials: J
authors.lastname: Paglione
authors.affiliation: HP-CAT, Geophysical Laboratory, Carnegie Institute of Washington, Argonne, Illinois 60439, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Chow
authors.affiliation: HP-CAT, Geophysical Laboratory, Carnegie Institute of Washington, Argonne, Illinois 60439, USA.
authors.forename: Yuming
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.
authors.forename: Chris A
authors.initials: CA
authors.lastname: Marianetti
authors.affiliation: Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Corwin H
authors.initials: CH
authors.lastname: Booth
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: Jason R
authors.initials: JR
authors.lastname: Jeffries