Engineering Papers⌕ Search
Home/Archive/DOE OSTI

DOE OSTI · 3385034

Small Co-doping induced magnetic and electrical transitions in single crystal CaF⁢e 0.95 ⁢C⁢o 0.05 ⁢O 3

Xia, Hailiang [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics] (ORCID:0009000841341895)·Liu, Zhehong [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000167316040)·Wu, Yan [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:000000031566614X)·Sun, Qian [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics]·Hayashi, Naoaki [Research Institute for Production Development, Kyoto (Japan)]·Shen, Xi [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000346772455)·Cao, Huibo [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000259704980)·dela Cruz, Clarina R. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000342332145)·Yu, Richeng [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000280860910)·Yang, Yi-feng [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000267026091)·Takano, Mikio [Research Institute for Production Development, Kyoto (Japan)]·Long, Youwen [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000285877818)
View original source ↗Read source document ↗Export metadata ↓

Abstract

CaFe⁢O 3 and CaF⁢e 0.95 ⁢C⁢o 0.05 ⁢O 3 single crystals were grown by combing floating-zone method with high oxygen pressure treatment. Both crystals show charge disproportionation of Fe (F⁡e 4+ → F⁡e 3+ + F⁡e 5+ ) accompanied by a metal-to-insulator transition as well as a crystal structural transformation from Pbnm to 𝑃⁢2 1 /𝑛. However, the slight introduction of Co significantly suppresses the critical temperature of charge disproportionation from 290 K in CaFe⁢O 3 to 260 K in CaF⁢e 0.95 ⁢C⁢o 0.05 ⁢O 3 . Different from the single antiferromagnetic phase transition as observed in the polycrystalline CaFe⁢O 3 , two sequential antiferromagnetic transitions are found to occur in these two single crystals with the Néel temperatures around 119 and 112 K for CaFe⁢O 3 crystal and 109 and 98 K for CaF⁢e 0.95 ⁢C⁢o 0.05 ⁢O 3 crystal, respectively. Neutron diffraction illustrates the formation of a spiral antiferromagnetic structure. Moreover, as the temperature further decreases to 65 K, a third magnetic transition accompanied by a second electrical transition is observed in the slightly Co-doped CaF⁢e 0.95 ⁢C⁢o 0.05 ⁢O 3 crystal. In conclusion, first-principles calculations suggest that the introduction of a moderate amount of Co and the peculiar spiral spin texture play an important role in the presence of such new magnetic and electrical transitions.

Keep this discovery

BibTeXRIS

Xia, Hailiang [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics] (ORCID:0009000841341895), Liu, Zhehong [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000167316040), Wu, Yan [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:000000031566614X), Sun, Qian [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics], Hayashi, Naoaki [Research Institute for Production Development, Kyoto (Japan)], Shen, Xi [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000346772455), Cao, Huibo [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000259704980), dela Cruz, Clarina R. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000342332145), Yu, Richeng [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000280860910), Yang, Yi-feng [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000267026091), Takano, Mikio [Research Institute for Production Development, Kyoto (Japan)], Long, Youwen [Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics; University of Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000285877818). 2026-06-18. Small Co-doping induced magnetic and electrical transitions in single crystal CaF⁢e 0.95 ⁢C⁢o 0.05 ⁢O 3. https://doi.org/10.1103/lssr-fzlr

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2025

Electric‐Field‐Driven Reversal of Ferromagnetism in (110)‐Oriented, Single Phase, Multiferroic Co‐Substituted BiFeO 3 Thin Films

Abstract While multiferroic materials are attractive systems for the promise of ultra‐low‐power‐consumption computational technologies, electric‐field‐induced magnetization reversal is a key challenge for realizing devices at scale. Though significant research efforts have been working toward the realization of a material which couples ferroelectricity and ferromagnetism, there are few, even composite, systems which are practical for device scale applications at room temperature. Co‐substituted multiferroic BiFe 0.9 Co 0.1 O 3 is a promising candidate system, due to coupled ferroelectricity and weak ferromagnetism at room temperature. Here, it is theoretically indicated that the ferroic orders in this material are statically coupled, where an in‐plane 109° ferroelectric switching event can result in the reversal of this out‐of‐plane component of magnetization, and the electric field‐induced magnetization reversal is experimentally observed. Such an in‐plane poling configuration is particularly desirable for device applications.

Chemistry↗
DOE OSTI2023

Design and Synthesis of Cubic K 3−2 x Ba x SbSe 4 Solid Electrolytes for K–O 2 Batteries

Developing K-ion conducting solid-state electrolytes (SSEs) plays a critical role in the safe implementation of potassium batteries. In this work, a chalcogenide-based potassium ion SSE is reported, K 3 SbSe 4 , which adopts a trigonal structure at room temperature. Single-crystal structural analysis reveals a trigonal-to-cubic phase transition at the low temperature of 50 °C, which is the lowest among similar compounds and thus provides easy access to the cubic phase. The substitution of barium for potassium in K 3 SbSe 4 leads to the creation of potassium vacancies, expansion of lattice parameters, and a transformation from a trigonal phase to a cubic phase. As a result, the maximum conductivity of K 3−2x Ba x SbSe 4 reaches around 0.1 mS cm −1 at 40 °C for K 2.2 Ba 0.4 SbSe 4 , which is over two orders of magnitude higher than that of undoped K 3 SbSe 4 . This novel SSE is successfully employed in a K–O 2 battery operating at room temperature where a polymer-laminated K 2.2 Ba 0.4 SbSe 4 pellet serves as a separator between the oxygen cathode and the potassium metal anode. Effective protection of the K metal anode against corrosion caused by O 2 is demonstrated.

25 ENERGY STORAGE↗
DOE OSTI2026

Decorated Honeycomb Lattice and Successive Magnetic Transitions of the Delafossite Derivative K 4 Ni 5 Te 3 O 16

Here, we report the synthesis and characterization of the delafossite derivative K 4 Ni 5 Te 3 O 16 , which hosts a decorated honeycomb Ni 2+ lattice. Single-crystal X-ray diffraction, electron microscopy, and neutron diffraction establish a noncentrosymmetric Pmm2 crystal structure that combines regular honeycomb units with elongated motifs formed by Ni 2+ trimers along extended edges. Magnetic susceptibility reveals strong antiferromagnetic interactions, while heat capacity measurements identify two successive magnetic transitions at 30 and 12 K. Neutron diffraction shows that these transitions correspond to a progression from partial to full long-range magnetic order on distinct Ni sites, reflecting competition among the various exchange interactions. The resulting magnetic point group, mm2.1′, inherits the lattice polarity and permits high-order magnetoelectric coupling. Consistent with this symmetry, a quadratic magnetic-field-induced polarization is experimentally observed below the magnetic ordering temperature, likely arising from exchange-driven magnetostriction coupled to the polar lattice. These results establish K 4 Ni 5 Te 3 O 16 as an interesting platform for engineering B-site ordering in delafossite derivatives to realize complex quantum magnetism and functional responses.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗