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- W2088648082 abstract "Heat capacity measurements of the delta-phase stabilized alloy Pu-Al suggest that strong electron-phonon coupling is required to explain the moderate renormalization of the electronic density of states near the Fermi energy. We calculate the heat capacity contributions from the lattice and electronic degrees of freedom as well as from the electron-lattice coupling term and find good overall agreement between experiment and theory assuming a dimensionless electron-phonon coupling parameter of order unity, lambda ~ 0.8. This large electron-phonon coupling parameter is comparable to reported values in other superconducting metals with face-centered cubic crystal structure, for example, Pd (lambda ~ 0.7) and Pb (lambda ~ 1.5). Further, our analysis shows evidence of a sizable residual low-temperature entropy contribution, S_{res} ~ 0.4 k_B (per atom). We can fit the residual specific heat to a two-level system. Therefore, we speculate that the observed residual entropy originates from crystal-electric field effects of the Pu atoms or from self-irradiation induced defects frozen in at low temperatures." @default.
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- W2088648082 date "2005-07-20" @default.
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- W2088648082 title "Strong electron-phonon coupling in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>δ</mml:mi></mml:math>-phase stabilized Pu" @default.
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- W2088648082 doi "https://doi.org/10.1103/physrevb.72.045135" @default.
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