arxiv: 1501.01719 · v1 · pith:VDLRVAAWnew · submitted 2015-01-08 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci· cond-mat.other· cond-mat.str-el

Superconductivity of Au-Ge-Yb Approximants with Tsai-Type Clusters

Kazuhiko Deguchi , Mika Nakayama , Shuya Matsukawa , Keiichiro Imura , Katsumasa Tanaka , Tsutomu Ishimasa , Noriaki K. Sato This is my paper

classification ❄️ cond-mat.supr-con cond-mat.mtrl-scicond-mat.othercond-mat.str-el

keywords superconductivitytsai-typeapproximantsformerlattermagnetismobservationapproximant

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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.

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Superconductivity of Au-Ge-Yb Approximants with Tsai-Type Clusters

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