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DOE OSTI · 2575546

Using magnetic dynamics to measure the spin gap in a candidate Kitaev material

Jiang, Xinyi [Peking University, Beijing (China)]·Qiu, Qingzheng [Peking University, Beijing (China)]·Peng, Cheng [Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)] (ORCID:0000000292671789)·Jang, Hoyoung [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000271609038)·Chen, Wenjie [Peking University, Beijing (China)]·Jin, Xianghong [Peking University, Beijing (China)]·Yue, Li [Peking University, Beijing (China)] (ORCID:0000000211344859)·Lee, Byungjune [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:000000030785030X)·Park, Sang-Youn [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000215004384)·Kim, Minseok [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)]·Kim, Hyeong-Do [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000290836519)·Cai, Xinqiang [Peking University, Beijing (China)]·Li, Qizhi [Peking University, Beijing (China)]·Dong, Tao [Peking University, Beijing (China)]·Wang, Nanlin [Peking University, Beijing (China); Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)] (ORCID:0000000325849265)·Turner, Joshua J. [Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000221067955)·Li, Yuan [Peking University, Beijing (China); Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)] (ORCID:0000000227470649)·Wang, Yao [Emory University, Atlanta, GA (United States)] (ORCID:0000000317360187)·Peng, Yingying [Peking University, Beijing (China); Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)] (ORCID:0000000226573590)
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Abstract

Spin-orbit entangled materials have attracted widespread interest due to the novel magnetic phenomena arising from the interplay between spin-orbit coupling and electronic correlations. However, the intricate nature of spin interactions within Kiteav materials complicates the precise measurement of low-energy spin excitations. Using Na 2 Co 2 TeO 6 as an example, we study these low-energy spin excitations using the time-resolved resonant elastic x-ray scattering (tr-REXS). Our observations unveil remarkably slow spin dynamics at the magnetic peak, whose recovery timescale is several nanoseconds. This timescale aligns with the extrapolated spin gap of ~1 μeV, obtained by density matrix renormalization group (DMRG) simulations in the thermodynamic limit. The consistency demonstrates the efficacy of tr-REXS in discerning low-energy spin gaps inaccessible to conventional spectroscopic techniques.

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36 MATERIALS SCIENCE

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Jiang, Xinyi [Peking University, Beijing (China)], Qiu, Qingzheng [Peking University, Beijing (China)], Peng, Cheng [Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)] (ORCID:0000000292671789), Jang, Hoyoung [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000271609038), Chen, Wenjie [Peking University, Beijing (China)], Jin, Xianghong [Peking University, Beijing (China)], Yue, Li [Peking University, Beijing (China)] (ORCID:0000000211344859), Lee, Byungjune [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:000000030785030X), Park, Sang-Youn [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000215004384), Kim, Minseok [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)], Kim, Hyeong-Do [Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000290836519), Cai, Xinqiang [Peking University, Beijing (China)], Li, Qizhi [Peking University, Beijing (China)], Dong, Tao [Peking University, Beijing (China)], Wang, Nanlin [Peking University, Beijing (China); Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)] (ORCID:0000000325849265), Turner, Joshua J. [Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000221067955), Li, Yuan [Peking University, Beijing (China); Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)] (ORCID:0000000227470649), Wang, Yao [Emory University, Atlanta, GA (United States)] (ORCID:0000000317360187), Peng, Yingying [Peking University, Beijing (China); Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)] (ORCID:0000000226573590). 2025-02-01. Using magnetic dynamics to measure the spin gap in a candidate Kitaev material. https://doi.org/10.1038/s41535-025-00737-8

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