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Synthesis and physical properties of the 10.6 K ferromagnet NdIr3

Author(s): Górnicka, Karolina; Xie, Weiwei; Carnicom, Elizabeth M.; Cava, Robert Joseph; Klimczuk, Tomasz W.

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Abstract: © 2019 American Physical Society. The magnetic, transport, and thermodynamic properties of NdIr3 are reported. Its PuNi3-type crystal structure (space group R-3m), with lattice parameters a=5.3262(1)Å and c=26.2218(3)Å, was confirmed by powder x-ray diffraction. Our measurements indicate that NdIr3 exhibits a previously unreported paramagnetic to ferromagnetic phase transition below TC=10.6K (determined by using the Arrott plot). The magnetic susceptibility obeys the Curie-Weiss law with an effective magnetic moment of μeff=3.63(2) μB/Nd and a paramagnetic Curie temperature θP=5.4(6)K. The heat-capacity anomaly at TC confirms a bulk nature of the transition, though ΔCp=11.7Jmol-1K-1 is lower than expected for J=9/2 and instead close to the J=1/2 system. This suggests that Nd ions are subject to the crystalline electrical field that removes spin degeneracy and leaves the Nd ions in a doublet ground state. Resistivity and heat-capacity measurements reveal an anomaly at around 70 K. The origin of this anomaly is unknown, but the lack of thermal hysteresis suggests that it is a second-order phase transition and may be related to electronic instabilities. The calculated electronic structure is reported.
Publication Date: 1-Mar-2019
Electronic Publication Date: 26-Mar-2019
Citation: Górnicka, K., Xie, W., Carnicom, E.M., Cava, R.J., Klimczuk, T. (2019). Synthesis and physical properties of the 10.6 K ferromagnet NdIr3. Physical Review B, 99 (10), 10.1103/PhysRevB.99.104430
DOI: doi:10.1103/PhysRevB.99.104430
ISSN: 2469-9950
EISSN: 2469-9969
Pages: 99.10:104430-1 - 104430-8
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Physical Review B. Volume 99, Issue 10, 26 March 2019, Article number 104430.

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