Valence Change Driven by Constituent Element Substitution in the Mixed-Valence Quasicrystal and Approximant Au-Al-Yb

Abstract

Quantum criticality has been considered to be specific to crystalline materials such as heavy fermions. Very recently, however, the Tsai-type quasicrystal Au51Al34Yb15 has been reported to show unusual quantum critical behavior. To obtain a deeper understanding of this new material, we have searched for other Tsai-type cluster materials. Here, we report that the metal alloys Au44Ga41Yb15 and Ag47Ga38Yb15 are members of the 1/1 approximant to the Tsai-type quasicrystal and that both possess no localized magnetic moment. We suggest that the Au-Al-Yb system is located near the border of the divalent and trivalent states of the Yb ion; we also discuss a possible origin of the disappearance of magnetism, associated with the valence change, by the substitution of the constituent elements.

21 pages, 6 figures, http://dx.doi.org/10.7566/JPSJ.83.034705

References in corpus (3)

• Quantum critical state in a magnetic quasicrystal
• Multiple energy scales at a quantum critical point
• Quantum Valence Criticality as Origin of Unconventional Critical Phenomena

Cited by in corpus (17)

• Valence Fluctuations and Electric Reconstruction in the Extended Anderson Model on the Two-Dimensional Penrose Lattice
• Superconductivity of Au-Ge-Yb Approximants with Tsai-Type Clusters
• Pressure-Driven Quantum Criticality and T/H Scaling in the Icosahedral Au-Al-Yb Approximant
• Distributed Hybridization Model for Quantum Critical Behavior in Magnetic Quasicrystals
• Origin of Quantum Criticality in Yb-Al-Au Approximant Crystal and Quasicrystal
• Crystal Structure of Superconducting 1/1 Cubic Au-Ge-Yb Approximant with Tsai-Type Cluster
• Crystalline Electronic Field in Rare-Earth Based Quasicrystal and Approximant: Analysis of Quantum Critical Au-Al-Yb Quasicrystal and Approximant
• Magnetic properties of icosahedral quasicrystals and their cubic approximants in the Cd-Mg-RE (RE = Gd, Tb, Dy, Ho, Er, and Tm) systems
• Valence Fluctuations in the Extended Anderson Lattice Model with Quasiperiodicity
• Effects of Crystalline Electronic Field and Onsite Interorbital Interaction in Yb-based Quasicrystal and Approximant Crystal
• Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants
• Wide Quantum Critical Region of Valence Fluctuations: Origin of Robust Quantum Criticality in Quasicrystal Yb15Al34Au51 under Pressure
• DMFT Study for Valence Fluctuations in the Extended Periodic Anderson Model
• New Quantum Criticality Revealed under Pressure
• Quasiperiodicity and valence fluctuation in the spin-1/2 Falicov-Kimball model
• Elastic Softening in Quantum Critical Yb-Al-Au Approximant Crystal and Quasicrystal
• Quantum Valence Criticality in Heavy Fermions on Periodic and Aperiodic Crystals