Chin. Phys. Lett.  2022, Vol. 39 Issue (12): 127501    DOI: 10.1088/0256-307X/39/12/127501
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Frustrated Magnetic Interactions and Quenched Spin Fluctuations in CrAs
Yayuan Qin1, Yao Shen1*, Yiqing Hao1, Hongliang Wo1,2, Shoudong Shen1, Russell A. Ewings3, Yang Zhao4,5, Leland W. Harriger4, Jeffrey W. Lynn4, and Jun Zhao1,2,6,7*
1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
2Shanghai Qizhi Institute, Shanghai 200232, China
3ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxon, OX11 0QX, United Kingdom
4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
5Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
6Institute of Nanoelectronics and Quantum Computing, Fudan University, Shanghai 200433, China
7Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
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Yayuan Qin, Yao Shen, Yiqing Hao et al  2022 Chin. Phys. Lett. 39 127501
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Abstract The discovery of pressure-induced superconductivity in helimagnets (CrAs, MnP) has attracted considerable interest in understanding the relationship between complex magnetism and unconventional superconductivity. However, the nature of the magnetism and magnetic interactions that drive the unusual double-helical magnetic order in these materials remains unclear. Here, we report neutron scattering measurements of magnetic excitations in CrAs single crystals at ambient pressure. Our experiments reveal well defined spin wave excitations up to about 150 meV with a pseudogap below 7 meV, which can be effectively described by the Heisenberg model with nearest neighbor exchange interactions. Most surprisingly, the spin excitations are largely quenched above the Néel temperature, in contrast to cuprates and iron pnictides where the spectral weight is mostly preserved in the paramagnetic state. Our results suggest that the helimagnetic order is driven by strongly frustrated exchange interactions, and that CrAs is at the verge of itinerant and correlation-induced localized states, which is therefore highly pressure-tunable and favorable for superconductivity.
Received: 23 September 2022      Editors' Suggestion Published: 22 November 2022
PACS:  75.30.Et (Exchange and superexchange interactions)  
  75.30.Ds (Spin waves)  
  25.40.Fq (Inelastic neutron scattering)  
  74.70.-b (Superconducting materials other than cuprates)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/39/12/127501       OR      https://cpl.iphy.ac.cn/Y2022/V39/I12/127501
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Yayuan Qin
Yao Shen
Yiqing Hao
Hongliang Wo
Shoudong Shen
Russell A. Ewings
Yang Zhao
Leland W. Harriger
Jeffrey W. Lynn
and Jun Zhao
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