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Field-Induced Criticality in YbCu4Au

Authors :: Taniguchi, T.
Osato, K.
Okabe, H.
Kitazawa, T.
Kawamata, M.
Hashimoto, S.
Ikeda, Y.
Nambu, Y.
Sari, D. P.
Watanabe, I.
Nakamura, J. G.
Koda, A.
Gouchi, J.
Uwatoko, Y.
Kittaka, S.
Sakakibara, T.
Mizumaki, M.
Kawamura, N.
Yamanaka, T.
Hiraki, K.
Sasaki, T.
Fujita, M.
Publication Year :: 2024
Abstract: YbCu4Au is a unique material exhibiting multiple quantum fluctuations simultaneously. In this study, we investigated the field-induced criticality in YbCu4Au, based on comprehensive micro and macro measurements, including powder X-ray diffraction (XRD), neutron powder diffraction (NPD), nuclear magnetic resonance, magnetization, resistivity, specific heat, muon spin rotation relaxation (muSR), and X-ray absorption spectroscopy (XAS). Single crystals of YbCu4Au were grown, and their crystal structure was determined using XRD, and NPD measurements. Magnetic successive transitions were observed below 1 T by specific heat, resistivity, NPD, and muSR measurements. XAS measurements further indicate that the valence of Yb ions (+2.93) remained unchanged above 2 T. Moreover, the change in quadrupole frequency observed in the previous study is attributable to the electric quadrupole, as the expected value of the electric quadrupole was finite under magnetic fields [S. Wada et al., Journal of Physics: Condensed Matter, 20, 175201 (2008).]. These experimental results suggest that YbCu4Au exhibited bicritical behavior near 1 T, arising from the competition between RKKY interaction, accounting for the magnetic phases, and the Zeeman effect.<br />Comment: 9 pages, 8 figures