Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Frustrated Magnetic Interactions and Quenched Spin Fluctuations in CrAs



Yayuan Qin, Yao Shen, Yiqing Hao, Hongliang Wo, Shoudong Shen, Russell A. Ewings, Yang Zhao, Leland Harriger, Jeffrey Lynn, Jun Zhao


The discovery of pressure-induced superconductivity in helimagnets (CrAs, MnP) has attracted significant 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 remain 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 ∼150 meV at 8 K, which can be effectively described by the Heisenberg model with highly frustrated nearest neighbored exchange interactions. In contrast to the clean spin gap commonly observed in cuprates and iron pnictides, CrAs shows a pseudogap behavior below 7 meV, exhibiting unique spin excitations associated with the helical order and easy-plane anisotropy. The pseudogap softens on warming and the spin waves are eventually replaced by short-range correlated incommensurate spin fluctuations above the N´eel temperature. Our results highlight the localized characteristics of the frustrated magnetism in CrAs and suggest that electronic correlations significantly influence its physical properties.
Chinese Physics Letters


Spin Dynamics, Superconductivity, Pressure, Frustrated Magnetism, Antiferromagnetic order, CrAs


Qin, Y. , Shen, Y. , Hao, Y. , Wo, H. , Shen, S. , Ewings, R. , Zhao, Y. , Harriger, L. , Lynn, J. and Zhao, J. (2022), Frustrated Magnetic Interactions and Quenched Spin Fluctuations in CrAs, Chinese Physics Letters, [online], (Accessed June 21, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created November 1, 2022, Updated January 23, 2024