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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.04894 |
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| _version_ | 1866909891888676864 |
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| author | Zhai, Hui-Fei Bud'ko, Sergey L. Fritsky, Jacob W. Khoury, Jason F. |
| author_facet | Zhai, Hui-Fei Bud'ko, Sergey L. Fritsky, Jacob W. Khoury, Jason F. |
| contents | Mixed valency in intermetallics with lanthanide cations is well established as a pathway to unusual charge transport, complex magnetism, and superconductivity. In this work, we report a comprehensive study of the structural, magnetic, electronic, and thermal properties of the mixed valent compound CeFe$_2$Ga$_8$. Powder X-ray diffraction (PXRD) and X-ray photoelectron spectroscopy (XPS) characterize CeFe$_2$Ga$_8$ as a quasi-one-dimensional (Q1D) compound with mixed-valent Ce$^{3+}$ and Ce$^{4+}$ on a single crystallographic site. $^{57}$Fe Mössbauer spectroscopy indicates that the Fe sublattice is nonmagnetic, in direct contrast with recent reports of this compound. Low-temperature electrical resistivity and heat capacity measurements show no evidence of magnetic ordering, and a modest Sommerfeld coefficient ($γ$) of 22.7 mJ/mol$\cdot$K$^2$ make extensive Kondo hybridization unlikely. DC and AC magnetic susceptibility data suggest short-range magnetic order at $\sim$5.2 and 7.6 K with no frequency dependence, ruling out canonical spin-glass behavior in this compound. Additionally, the magnetic susceptibility data does not contain any broad features that are typically associated with an intermediate valence state in Ce, suggesting either high-temperature valence fluctuation or a different mechanism of mixed valency. This work demonstrates that mixed-valent Ce inhibits magnetic ordering in CeFe$_2$Ga$_8$ and provides a broader picture for how to analyze short-range spin interactions in Q1D intermetallics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_04894 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mixed-Valent Ce Disrupts Magnetic Ordering in CeFe$_2$Ga$_8$ Zhai, Hui-Fei Bud'ko, Sergey L. Fritsky, Jacob W. Khoury, Jason F. Materials Science Mixed valency in intermetallics with lanthanide cations is well established as a pathway to unusual charge transport, complex magnetism, and superconductivity. In this work, we report a comprehensive study of the structural, magnetic, electronic, and thermal properties of the mixed valent compound CeFe$_2$Ga$_8$. Powder X-ray diffraction (PXRD) and X-ray photoelectron spectroscopy (XPS) characterize CeFe$_2$Ga$_8$ as a quasi-one-dimensional (Q1D) compound with mixed-valent Ce$^{3+}$ and Ce$^{4+}$ on a single crystallographic site. $^{57}$Fe Mössbauer spectroscopy indicates that the Fe sublattice is nonmagnetic, in direct contrast with recent reports of this compound. Low-temperature electrical resistivity and heat capacity measurements show no evidence of magnetic ordering, and a modest Sommerfeld coefficient ($γ$) of 22.7 mJ/mol$\cdot$K$^2$ make extensive Kondo hybridization unlikely. DC and AC magnetic susceptibility data suggest short-range magnetic order at $\sim$5.2 and 7.6 K with no frequency dependence, ruling out canonical spin-glass behavior in this compound. Additionally, the magnetic susceptibility data does not contain any broad features that are typically associated with an intermediate valence state in Ce, suggesting either high-temperature valence fluctuation or a different mechanism of mixed valency. This work demonstrates that mixed-valent Ce inhibits magnetic ordering in CeFe$_2$Ga$_8$ and provides a broader picture for how to analyze short-range spin interactions in Q1D intermetallics. |
| title | Mixed-Valent Ce Disrupts Magnetic Ordering in CeFe$_2$Ga$_8$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.04894 |