Observation of quantum oscillations near the Mott-loffe-Regel limit in CaAs3

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外文摘要：The Mott-Ioffe-Regel limit sets the lower bound of the carrier mean free path for coherent quasiparticle transport.Metallicity beyond this limit is of great interest because it is often closely related to quantum criticality and unconventional superconductivity.Progress along this direction mainly focuses on the strange-metal behaviors originating from the evolution of the quasiparticle scattering rate,such as linear-in-temperature resistivity,while the quasiparticle coherence phenomena in this regime are much less explored due to the short mean free path at the diffusive bound.Here we report the observation of quantum oscillations from Landau quantization near the Mott-Ioffe-Regel limit in CaAs3.Despite the insulator-like temperature dependence of resistivity,CaAs3 presents giant magnetoresistance and prominent Shubnikov-de Haas oscillations from Fermi surfaces,indicating highly coherent band transport.In contrast,quantum oscillation is absent in the magnetic torque.The quasiparticle effective mass increases systematically with magnetic fields,manifesting a much larger value than what is expected based on magneto-infrared spectroscopy.This suggests a strong many-body renormalization effect near the Fermi surface.We find that these unconventional behaviors may be explained by the interplay between the mobility edge and the van Hove singularity,which results in the formation of coherent cyclotron orbits emerging at the diffusive bound.Our results call for further study on the electron correlation effect of the van Hove singularity.

外文关键词：

Mott-Ioffe-Regel limitquantum oscillationsvan Hove singularitymobility edge

作者：

Yuxiang Wang、Minhao Zhao、Jinglei Zhang、Wenbin Wu、Shichao Li、Yong Zhang、Wenxiang Jiang、Nesta Benno Joseph、Liangcai Xu、Yicheng Mou、Yunkun Yang、Pengliang Leng、Li Pi、Alexey Suslov、Mykhaylo Ozerov、Jan Wyzula、Milan Orlita、Fengfeng Zhu、Yi Zhang、Xufeng Kou、Zengwei Zhu、Awadhesh Narayan、Dong Qian、Jinsheng Wen、Xiang Yuan、Faxian Xiu、Cheng Zhang

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作者单位：

State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing,Fudan University,Shanghai 200433,China

State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China

Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,Hefei 230031,China

State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China

National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China

Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

Solid State and Structural Chemistry Unit,Indian Institute of Science,Bangalore 560012,India

Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China

National High Magnetic Field Laboratory,Tallahassee,FL 32310,USA

LNCMI-CNRS UPR3228,Université Grenoble Alpes,Grenoble Cedex 938042,France

International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China

School of Information Science and Technology,ShanghaiTech University,Shanghai 201210,China

School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China

Shanghai Center of Brain-Inspired Intelligent Materials and Devices,East China Normal University,Shanghai 200241,China

Shanghai Qi Zhi Institute,Shanghai 200232,China

Zhangjiang Fudan International Innovation Center,Fudan University,Shanghai 201210,China

Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

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出版年：

2024

DOI：

10.1093/nsr/nwae127

国家科学评论(英文版)

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ISSN：

年,卷(期)：2024.11(12)