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Emerging Magnetism Arising from Self Damage in α- and δ-Pu

Published online by Cambridge University Press:  26 February 2011

Scott McCall,
Micheal J Fluss,
Brandon W Chung,
George F Chapline,
Damon D Jackson and
Micheal W McElfresh
Scott McCall
Affiliation:
mccall10@llnl.gov, Lawrence Livermore National Laboratory, United States
Micheal J Fluss
Affiliation:
fluss1@llnl.gov, Lawrence Livermore National Laboratory, United States
Brandon W Chung
Affiliation:
chung7@llnl.gov, Lawrence Livermore National Laboratory, United States
George F Chapline
Affiliation:
chapline1@llnl.gov, Lawrence Livermore National Laboratory
Damon D Jackson
Affiliation:
jackson59@llnl.gov, Lawrence Livermore National Laboratory
Micheal W McElfresh
Affiliation:
mcelfresh1@llnl.gov, Lawrence Livermore National Laboratory
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Abstract

As a consequence of the unusual nature of plutonium's electronic structure, point- and extended-defects are expected to, and do exhibit extraordinary properties. Low temperature magnetic susceptibility measurements on Pu and fcc-Pu(Ga) show that the magnetic susceptibility increases as a function of time, yet upon annealing the specimen returns to its initial magnetic susceptibility. This excess magnetic susceptibility (EMS) arises from the alpha-decay and U recoil damage cascades which produce vacancy and interstitials as point and extended defects. The temperature of the first annealing stage defines a temperature (<35K) below which we are able to characterize the time and temperature evolution of the accumulating damage cascades as being a saturation function. The temperature dependence of the EMS is well described by a time independent, Curie-Weiss curve arising from a volumetric region surrounding each U damage cascade. This saturation picture also leads directly to a determination of the microscopic volume of the specimen that is affected by the frozen-in damage cascade. For our measurements in δ-Pu we calculate a diameter of the magnetically affected volume of ∼250Å per damage cascade. This should be compared with an estimated volume that encloses the damage cascade itself (determined from molecular dynamics) of ∼100 Å. Hence, the ratio of these volumes is ∼8. The observed anomalous magnetic behavior is likely a consequence of the highly correlated nature of the electrons. Similarities with defects in hole-doped superconductors suggest a general phenomenon in strongly correlated electron systems, of which Pu may be a particularly unusual or special example.

Keywords

Puradiation effectsmagnetic properties

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