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arXiv · 2406.05823

Manipulating magnetism and transport properties of EuCd$_2$P$_2$ with a low carrier concentration

Xiyu Chen·Ziwen Wang·Zhiyu Zhou·Wuzhang Yang·Yi Liu·Jia-Yi Lu·Zhi Ren·Guang-Han Cao·Fazel Tafti·Shuai Dong·Zhi-Cheng Wang
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Abstract

Materials that exhibit strongly coupled magnetic order and electronic properties are crucial for both fundamental research and technological applications. However, finding a material that not only shows remarkable magnetoresistive responses but also has an easily tunable ground state remains a challenge. Here, we report successful manipulation of the magnetic and transport properties of EuCd$_2$P$_2$, which is transformed from an A-type antiferromagnet ($T_\mathrm{N}$ = 11 K) exhibiting colossal magnetoresistance into a ferromagnet ($T_\mathrm{C}$ = 47 K) with metallic behavior. The dramatic alteration results from a low hole concentration of $10^{19}$ cm$^{-3}$ induced by changing the growth conditions. Electronic structure and total energy calculations confirm the tunability of magnetism with a small carrier concentration for EuCd$_2$P$_2$. It is feasible to switch between the magnetic states by using field-effect to control the carrier density, thereby changing the magneto-electronic response. The controllable magnetism and electrical transport of EuCd$_2$P$_2$ make it a potential candidate for spintronics.

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Xiyu Chen, Ziwen Wang, Zhiyu Zhou, Wuzhang Yang, Yi Liu, Jia-Yi Lu, Zhi Ren, Guang-Han Cao, Fazel Tafti, Shuai Dong, Zhi-Cheng Wang. 2024-06-09. Manipulating magnetism and transport properties of EuCd$_2$P$_2$ with a low carrier concentration. https://doi.org/10.1103/physrevb.109.224428

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