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Absence of superconductivity in fluorine-doped neptunium pnictide NpFeAsO

DOI: 10.1088/0953-8984/27/32/325702 DOI Help
PMID: 26214712 PMID Help

Authors: A. C. Walters (Diamond Light Source) , H. C. Walker (ISIS) , R. Springell (University of Bristol) , M. Krisch (ESRF) , A. Bosak (ESRF) , A. H. Hill (ESRF) , C. E. Zvorişte-walters (European Commission, Joint Research Centre (JRC)) , E. Colineau (European Commission, Joint Research Centre (JRC)) , J.-c. Griveau (European Commission -Joint Research Centre) , D. Bouëxière (European Commission, Joint Research Centre (JRC)) , R. Eloirdi (European Commission, Joint Research Centre (JRC)) , R. Caciuffo (European Commission, Joint Research Centre (JRC)) , T. Klimczuk (Gdansk University of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 27

State: Published (Approved)
Published: August 2015

Abstract: X-ray diffraction, specific heat, magnetic susceptibility and inelastic x-ray scattering measurements on the transurarium oxypnictides NpFeAsO and NpFeAsO0.85F0.15 are presented. No superconductivity down to 2 K was observed upon fluorine doping, contrary to the structurally analogous rare-earth pnictides. No modification of the phonon density of states was observed upon doping with fluorine. We discuss our results in light of the latest experimental and theoretical studies on the role of phonons in the superconducting pnictide compounds.

Subject Areas: Physics

Facility: ESRF