Volume 48, Number 5, December 1999
|Page(s)||568 - 572|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Resonant defect scattering in thorium-doped
Institut für Physik, Universität Augsburg, Universitätsstrasse 1, 86159 Augsburg, Germany
2 Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA
Accepted: 30 September 1999
Low-temperature specific-heat measurements on reveal a linear contribution at lowest temperatures which varies systematically with thorium concentration. Size and concentration dependence of this contribution can be explained by resonant defect scattering of the Th impurities in an anisotropic superconductor with gap nodes. The most meaningful observation, however, is that shows relatively sharp minima at both critical concentrations ( at%, at%) in the phase diagram of ; in between these concentrations a double-maximum structure in the temperature-dependent specific heat is observed. These sharp minima are strong indications of a sudden change in the superconducting ground state at the critical concentrations. This direct information about the gap nodes is important for theory to explain the complex phase diagram of .
PACS: 74.25.Bt – Thermodynamic properties / 74.70.Tx – Heavy-fermion superconductors
© EDP Sciences, 1999
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