Abstract
Pentagonal-ring-structured PtP2 bulk crystals and the two-dimensional (2D) PtP2 with rich theoretical physical and chemical properties have attracted considerable attention for the applications in high-performance electronic and optoelectronic devices. Here, high-quality PtP2 single crystals have been successfully prepared by using a tin flux method with the optimal molar ratios of Pt and P. 3D weak localization effect and negative magnetoresistance (NMR) are observed in the high-quality PtP2 single crystals for the first time. Crystalline structure, magnetization, and optical spectral characterizations have demonstrated that the defects in PtP2 crystals can suppress the NMR effect and magnetic ordered states. These findings open up a way to synthesize the bulk and low-dimensional noble-metal-based phosphides of high quality and provide new platforms for studying the different correlated electronic states.
摘要
近年来, 含有五元环排列结构的PtP2单晶和二维材料因具有丰富 的物理和化学性能而得到广泛关注, 有望应用于高性能电子和光电子 器件. 本文通过优化Pt和P的初始摩尔比, 采用助溶剂法制备了高质量 的PtP2单晶, 并在PtP2单晶中首次发现了三维弱局域化和负磁阻效应. 晶体结构、磁性和光谱测试表明, PtP2单晶中的少量缺陷可抑制负磁 阻效应和磁有序态. 本文提出了合成高质量贵金属磷化物单晶的有效 方法, 为研究磷化物中多种关联电子态提供了新的平台
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (61888102, 22178384, 21908245, and 22108301), the Ministry of Science and Technology of China (2018YFA0305800), the Chinese Academy of Sciences (ZDBS-SSW-WHC001 and XDB33030100), and the Science Foundation of China University of Petroleum, Beijing (ZX20220079).
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Li Y and Yang H supervised and coordinated the project. Cheng Q synthesized the crystal and performed most of measurements. Xian G and Guo H analyzed the magnetization and transport data. Huang Y and Chen H performed the femtosecond time-resolved absorption spectra. Zhou H and Wang J performed the temperature-dependent XRD analysis. Cheng Q, Yang H, Xian G, Guo H, and Li Y did data analysis and wrote the manuscript. All of the authors participated in analyzing the experimental data, plotting figures, and writing the manuscript.
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The authors declare that they have no conflict of interest.
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Supporting data are available in the online version of the paper.
Qiuzhen Cheng is currently a PhD candidate at China University of Petroleum, Beijing. His main research focuses on the preparation and characterization of transition metal compounds and their low-dimensional materials.
Guoyu Xian is currently a PhD student at the Institute of Physics, Chinese Academy of Sciences. He received his MSc degree in physics from Hunan University in 2020. His research interest focuses on physical properties of crystals and low-dimensional materials.
Yongfeng Li is a professor at the College of New Energy and Materials, China University of Petroleum, Beijing. He obtained his PhD degree from Dalian University of Technology in 2004. He was a postdoctor at Tohoku University, Japan from 2004 to 2012. His current research interests mainly focus on the synthesis and application of new bulk and low-dimensional materials.
Haitao Yang is a professor at the Institute of Physics, Chinese Academy of Sciences. He obtained his PhD degree from the Institute of Physics in 2004. He was a postdoctor at Tohoku University, Japan from 2004 to 2008. His current research interests mainly focus on superconductivity, spin polarization, and electron correlated states of crystals and low-dimensional materials.
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Cheng, Q., Xian, G., Huang, Y. et al. Three-dimensional weak localization and negative magnetoresistance in high-quality PtP2 crystals. Sci. China Mater. 66, 2393–2399 (2023). https://doi.org/10.1007/s40843-022-2366-4
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DOI: https://doi.org/10.1007/s40843-022-2366-4