Abstract
Strongly frustrated magnetism of the metallic pyrochlore oxide has been revealed by single crystal study. While Pr moments have an antiferromagnetic RKKY interaction energy scale of mediated by Ir -conduction electrons, no magnetic long-range order is found except for partial spin freezing at 120 mK. Instead, the Kondo effect, including a dependence in the resistivity, emerges and leads to a partial screening of the moments below . Our results indicate that the underscreened moments show spin-liquid behavior below a renormalized correlation scale of 1.7 K.
- Received 23 July 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.087204
©2006 American Physical Society