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.

5 pages, 4 figures, http://dx.doi.org/10.7566/JPSJ.84.023705

References in corpus (2)

• Quantum critical state in a magnetic quasicrystal
• Crystal Structure of Superconducting 1/1 Cubic Au-Ge-Yb Approximant with Tsai-Type Cluster

Cited by in corpus (12)

• Superconductivity on a Quasiperiodic Lattice: Extended-to-Localized Crossover of Cooper Pairs
• Conventional superconductivity in quasicrystals
• Magnetic orders induced by RKKY interaction in Tsai-type quasicrystalline approximant Au-Al-Gd
• Josephson effect in a Fibonacci quasicrystal
• Topological superconductivity in Fibonacci quasicrystals
• Unconventional superfluidity of superconductivity on Penrose lattice
• Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants
• Ising model on the aperiodic Smith hat
• Superconductivity and charge-density-wave in the Holstein model on the Penrose Lattice
• Quasiperiodicity and valence fluctuation in the spin-1/2 Falicov-Kimball model
• Superconducting order parameter in aperiodic binary systems
• Soft and hard x-ray orbital-resolved photoemission study of a strongly correlated Cd-Ce quasicrystal approximant