Superconductivity of Au-Ge-Yb Approximants with Tsai-Type Clusters
Abstract
We report the emergence of bulk superconductivity in Au64.0Ge22.0Yb14.0 and Au63.5Ge20.5Yb16.0 below 0.68 and 0.36 K, respectively. This is the first observation of superconductivity in Tsai-type crystalline approximants of quasicrystals. The Tsai-type cluster center is occupied by Au and Ge ions in the former approximant, and by an Yb ion in the latter. For magnetism, the latter system shows a larger magnetization than the former. To explain this observation, we propose a model that the cluster-center Yb ion is magnetic. The relationship between the magnetism and the superconductivity is also discussed.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- February 2015
- DOI:
- 10.7566/JPSJ.84.023705
- arXiv:
- arXiv:1501.01719
- Bibcode:
- 2015JPSJ...84b3705D
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science;
- Condensed Matter - Other Condensed Matter;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages, 4 figures, http://dx.doi.org/10.7566/JPSJ.84.023705