## Abstract

The ternary alloy Ag-In-Ce is the only Ce-based quasicrystal approximant showing the heavy fermion feature. Here, we report the physical properties of Ag-In-(Ce_{x}Y_{1}−_{x}). As the Ce concentration x is diluted by the nonmagnetic element Y, the spin glass freezing temperature T_{f} is progressively suppressed. At T > T_{f}, the uniform magnetic susceptibility and electronic specific heat coefficient show χðT; xÞ-^{1} ¼ α½T ζ þ θ_{e ζ ff}ðxÞ] (where α is a constant, ζ' 0.7, and θ_{eff} is an effective Weiss temperature) and CðT; xÞ=T ¼ β ln½T=T_{0}ðxÞ] (where β is a constant and T_{0} is a characteristic temperature), respectively. Near the critical concentration x_{c} where θ_{eff} vanishes, χ and C=T exhibit power-law and logarithmic divergence, respectively, as T → 0. We stress that α, ζ, and β are independent of x, indicating that the T ^{ζ} and ln T terms come from local fluctuations that are present everywhere in the x-T phase diagram, regardless of quantum critical point. We argue that the quantum critical behavior is driven by valence fluctuations.

Original language | English |
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Article number | 014703 |

Journal | journal of the physical society of japan |

Volume | 89 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2020 |

## ASJC Scopus subject areas

- Physics and Astronomy(all)

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