Abstract
We report measurements of the electromagnetic penetration depth in nominally pure crystals of , for temperatures close to the critical temperature . Over the range , we find that with , consistent with the critical behavior of the three dimensional model. The measured critical behavior is not affected by the presence of small amounts of Zn impurities, in agreement with the Harris criterion.
- Received 21 March 1994
DOI:https://doi.org/10.1103/PhysRevLett.73.1845
©1994 American Physical Society