Study of the ferromagnetic quantum phase transition in Ce_3−xMg_xCo₉

ABSTRACT

The Ce${}_{3-x}$Mg${}_x$Co${}_9$ system evolves from a Pauli paramagnetic ground state for x = 0 to a ferromagnetic ground state for $x\approx 0.80$ in single-phase, polycrystalline samples [Lamichhane, V. Taufour, A. Palasyuk, Q. Lin, S.L. Budko, and P.C. Canfield, ${\mathrm{C}\mathrm{e}}_{3-x}{\mathrm{M}\mathrm{g}}_x{\mathrm{C}\mathrm{o}}_9$: transformation of a Pauli paramagnet into a strong permanent magnet, Phys. Rev. Appl. 9 (2018), p. 024023]. In order to better understand this behaviour, single-crystalline samples of Ce${}_{3-x}$Mg${}_x$Co${}_9$ for x = 0.01, 0.16, 0.24, 0.35, 0.43 and 0.50 were grown using the flux growth technique, and electrical transport and magnetic properties were studied. The $T_C$-x phase diagram we infer shows that the system has a quantum phase transition near x = 0.35, transforming to a ferromagnetic ground state.

KEYWORDS:

• Pauli maramagnet
• quantum phase transition
• ferromagnet

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Correction

Acknowledgments

Dr Warren Straszheim is acknowledged for doing SEM on various samples.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article was originally published with errors, which have now been corrected in the online version. Please see Correction (http://dx.doi.org/10.1080/14786435.2022.2157528)

Additional information

Funding

This research was supported by the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. This work was performed at the Ames Laboratory, operated for DOE by Iowa State University under Contract No. DE-AC02-07CH11358.