| Autor: |
Huayao Li, Guohua Wang, Ning Ding, Quan Ren, Gan Zhao, Wenting Lin, Jinchuan Yang, Wensheng Yan, Qian Li, Run Yang, Shijun Yuan, Denlinger, Jonathan D., Zhenxing Wang, Xiaoqian Zhang, Wray, L. Andrew, Shuai Dong, Dong Qian, Lin Miao |
| Předmět: |
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| Zdroj: |
Proceedings of the National Academy of Sciences of the United States of America; 7/9/2024, Vol. 121 Issue 28, p1-6, 16p |
| Abstrakt: |
Iron antimonide (FeSb2) has been investigated for decades due to its puzzling electronic properties. It undergoes the temperature-controlled transition from an insulator to an ill-defined metal, with a cross-over from diamagnetism to paramagnetism. Extensive efforts have been made to uncover the underlying mechanism, but a consensus has yet to be reached. While macroscopic transport and magnetic measurements can be explained by different theoretical proposals, the essential spectroscopic evidence required to distinguish the physical origin is missing. In this paper, through the use of X-ray absorption spectroscopy and atomic multiplet simulations, we have observed the mixed spin states of 3d6 configuration in FeSb2. Furthermore, we reveal that the enhancement of the conductivity, whether induced by temperature or doping, is characterized by populating the high-spin state from the low-spin state. Our work constitutes vital spectroscopic evidence that the electrical/magnetical transition in FeSb2 is directly associated with the spin-state excitation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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