Magnetic field tuned magnetic order and metamagnetic criticality in nonstoichiometric CeAuBi2

Published

February 20, 2026

Author(s)

Halyna Hodovanets, Hyunsoo Kim, Tristin Metz, Yasuyuki Nakajima, Christopher Eckbert, Kefeng Wang, Jie Yong, Shanta Saha, David Graf, Nicholas Butch, Thomas Vojta, Johnpierre Paglione

Abstract

We present a detailed study of magnetization, resistivity, heat capacity, and x-ray and neutron powder diffraction measurements performed on single crystals of nonstoichiometric CeAuBi2, Au deficiency 18%, a strongly correlated antiferromagnet with Néel temperature TN = 13.2 K. Field-dependent magnetization measurements reveal a large magnetic anisotropy at low temperatures with an easy axis along the crystallographic c axis, in which direction a spin-flop transition exhibits strong features in magnetization, specific heat, and resistivity at Hc = 75 kOe. The constructed temperature-field phase diagram connects this transition to the suppression of magnetic order, which evolves from a second-order nature into a first-order transition that bifurcates at the spin-flop transition into three transitions below 1 K. The smoothed nature of the metamagnetic transitions in nonstoichiometric CeAuBi2 is well described by an Ising model with weak quenched disorder, suggesting that the presence of Au vacancies is sufficient to smear the complex metamagnetic behavior and tune the critical behavior of magnetic order.

Citation

Physical Review B

Volume

113

Pub Type

Journals

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DOI Link

Keywords

magnetization, resistiivity, heat capacity, neutron diffraction

Citation

Hodovanets, H. , Kim, H. , Metz, T. , Nakajima, Y. , Eckbert, C. , Wang, K. , Yong, J. , Saha, S. , Graf, D. , Butch, N. , Vojta, T. and Paglione, J. (2026), Magnetic field tuned magnetic order and metamagnetic criticality in nonstoichiometric CeAuBi2, Physical Review B, [online], https://dx.doi.org/10.1103/1qcc-by7y (Accessed June 23, 2026)

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