Title: Probing magnetism in the vortex phase of PuCoGa5 by X-ray magnetic circular dichroism
Authors: MAGNANI NICOLAELOIRDI RACHELWILHELM F.COLINEAU ERICGRIVEAU JEAN-CHRISTOPHESHICK ALEXANDER B.LANDER G. H.ROGALEV A.CACIUFFO ROBERTO
Citation: PHYSICAL REVIEW LETTERS vol. 119 no. 15 p. 157204
Publisher: AMER PHYSICAL SOC
Publication Year: 2017
JRC N°: JRC106938
ISSN: 0031-9007
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC106938
DOI: 10.1103/PhysRevLett.119.157204
Type: Articles in periodicals and books
Abstract: We have measured X-ray magnetic circular dichroism (XMCD) spectra at the Pu M4;5 absorption edges from a newly-prepared high-quality single crystal of the heavy fermion superconductor 242PuCoGa5, exhibiting a critical temperature Tc = 18.7 K. The experiment probes the vortex phase below Tc and shows that an external magnetic field induces a Pu 5f magnetic moment at 2 K equal to the temperature-independent moment measured in the normal phase up to 300 K by a SQUID device. This observation is in agreement with theoretical models claiming that the Pu atoms in PuCoGa5 have a nonmagnetic singlet ground state resulting from the hybridization of the conduction electrons with the intermediate-valence 5f electronic shell. Unexpectedly, XMCD spectra show that the orbital component of the 5f magnetic moment increases significantly between 30 and 2 K; the antiparallel spin component increases as well, leaving the total moment practically constant. We suggest that this indicates a low-temperature breakdown of the complete Kondo-like screening of the local 5f moment.
JRC Directorate:Nuclear Safety and Security

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