Issue |
Europhys. Lett.
Volume 48, Number 5, December 1999
|
|
---|---|---|
Page(s) | 568 - 572 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1999-00521-4 | |
Published online | 01 September 2002 |
Resonant defect scattering in thorium-doped
1
Institut für Physik, Universität Augsburg, Universitätsstrasse 1, 86159 Augsburg, Germany
2
Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA
Received:
1
June
1999
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.