Abstract
The filled skutterudite superconductor was studied in muon-spin rotation (), specific heat, and electrical resistivity experiments. The continuous increase of the superfluid density with decreasing temperature and the dependence of the magnetic penetration depth on the magnetic field obtained by means of , as well as the observation of a dependence of the electronic specific heat indicate the presence of pointlike nodes in the superconducting energy gap. The gap and the specific heat are found to be well described by two models with point nodes, similar to results obtained for the unconventional heavy fermion skutterudite superconductor .
- Received 6 February 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.147002
©2009 American Physical Society