TY - JOUR
T1 - Local quantum fluctuations in kondo quasicrystal approximant Ag-In-(CexY1−x)
AU - Sawano, Takuya
AU - Shiino, Takayuki
AU - Imura, Keiichiro
AU - Deguchi, Kazuhiko
AU - Ohhashi, Satoshi
AU - Tsai, An Pang
AU - Sato, Noriaki K.
N1 - Funding Information:
Acknowledgments The authors thank T. Ishimasa for useful comments on the work. This work was partially supported by JSPS KAKENHI, Grant Numbers 26870265, 15H02111, 15H03685, and 16H01071.
Publisher Copyright:
© 2020 Society The Author(s) of Japan
PY - 2020
Y1 - 2020
N2 - 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-(CexY1−x). As the Ce concentration x is diluted by the nonmagnetic element Y, the spin glass freezing temperature Tf is progressively suppressed. At T > Tf, the uniform magnetic susceptibility and electronic specific heat coefficient show χðT; xÞ-1 ¼ α½T ζ þ θe ζ ffðxÞ] (where α is a constant, ζ' 0.7, and θeff is an effective Weiss temperature) and CðT; xÞ=T ¼ β ln½T=T0ðxÞ] (where β is a constant and T0 is a characteristic temperature), respectively. Near the critical concentration xc where θeff 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.
AB - 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-(CexY1−x). As the Ce concentration x is diluted by the nonmagnetic element Y, the spin glass freezing temperature Tf is progressively suppressed. At T > Tf, the uniform magnetic susceptibility and electronic specific heat coefficient show χðT; xÞ-1 ¼ α½T ζ þ θe ζ ffðxÞ] (where α is a constant, ζ' 0.7, and θeff is an effective Weiss temperature) and CðT; xÞ=T ¼ β ln½T=T0ðxÞ] (where β is a constant and T0 is a characteristic temperature), respectively. Near the critical concentration xc where θeff 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.
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U2 - 10.7566/JPSJ.89.014703
DO - 10.7566/JPSJ.89.014703
M3 - Article
AN - SCOPUS:85078161925
VL - 89
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 1
M1 - 014703
ER -