Heat capacity, resistivity, and angular dependent magnetization studies of single crystal ${\text{Nd}}_{1+ϵ}{\text{Fe}}_4{\text{B}}_4$ for $ϵ\approx \frac{1}{7}$

Journal Article · 04 April 2017 · Journal of Magnetism and Magnetic Materials

DOI: https://doi.org/10.1016/j.jmmm.2017.04.002 · OSTI ID:1350932

Conner, Benjamin S. ^[1]; Susner, Michael A. ^[1]; Lampen-Kelley, Paula ^[1]; May, Andrew F. ^[1]; McGuire, Michael A. ^[1]; Yan, Jiaqiang ^[1]; Sales, Brian C. ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Advances in crystal growth have allowed for synthesis of large single crystals of Nd_1+ϵFe₄B₄, a well-known phase with a modulated structure. As a result we are able to report heat capacity and resistivity measurements on a single crystal Nd_1+ϵFe₄B₄ sample with a distribution of ϵ that skews towards the solubility limit of Nd near ϵ ≈ 17. Heat capacity measurements show evidence of crystal field splitting at temperatures higher than the long-range ferromagnetic Curie temperature. Heat capacity, resistivity, and magnetization measurements all confirm a Curie temperature of 7 K which is lower than previously reported values in the Nd_1+ϵFe₄B₄ system. Here, we also perform measurements of the angular dependence of the magnetization and discover behavior associated with the magnetic anisotropy that is inconsistent with the simple description previously proposed.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Critical Materials Institute (CMI)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1350932
• Alternate ID(s): OSTI ID: 1396908
• Journal Information: Journal of Magnetism and Magnetic Materials, Vol. 435, Issue C; ISSN 0304-8853
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English