Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)
TT 14.3: Poster
Mittwoch, 26. März 2003, 14:30–19:00, P2c
Superconductivity caused by the pairing of plutonium 5f electrons in PuCoGa5 — •Ingo Opahle and Peter M. Oppeneer — IFW Dresden
On the basis of fully relativistic, full-potential electronic structure calculations we identify the superconductivity in the novel, high-temperature superconductor PuCoGa5 (Tc = 18.5 K)to be caused by the pairing of Pu 5f electrons. Assuming delocalized Pu 5f states we compute theoretical crystallographic constants very near to the experimental ones, and also the calculated linear-temperature specific-heat coefficient compares reasonably to the measured coefficient. The theoretical Fermi surface is quasi-two-dimensional, and the system appears to be close to an instability, as is indicated by a narrow peak in the density of states just below the Fermi energy.