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arxiv: 2512.00972 · v2 · submitted 2025-11-30 · ❄️ cond-mat.mtrl-sci · cond-mat.str-el

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Observation of hidden altermagnetism in Cs_{1-δ}V₂Te₂O

Guowei Yang , Ruihan Chen , Changchao Liu , Jing Li , Ze Pan , Teng Hua , Pengyue Xiong , Liwei Deng
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Naifu Zheng Yu Tang Hao Zheng Weifan Zhu Yifu Xu Xinying Zheng Xin Ma Xiaoping Wang Shengtao Cui Zhe Sun Zhengtai Liu Mao Ye Chao Cao Ming Shi Lunhui Hu Qihang Liu Shan Qiao Guanghan Cao Yu Song Yang Liu
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classification ❄️ cond-mat.mtrl-sci cond-mat.str-el
keywords altermagnetismarpesdeltahiddenaltermagneticmodulationsreal-spacespatially
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Altermagnets are characterized by anisotropic band/spin splittings in momentum space, dictated by their spin-space group symmetries. However, the real-space modulations of altermagnetism are often neglected and have not been explored experimentally. Here we combine neutron diffraction, angle-resolved photoemission spectroscopy (ARPES), spin-resolved ARPES and density functional theory to demonstrate that Cs$_{1-\delta}$V$_2$Te$_2$O realizes a spatially modulated form of altermagnetism, i.e., hidden altermagnetism. Such a state in Cs$_{1-\delta}$V$_2$Te$_2$O results from its G-type antiferromagnetism and two-dimensional electronic states, allowing for the development of spatially alternating altermagnetic layers, whose local spin polarizations are directly verified by spin-resolved ARPES measurements. Our experimental discovery of hidden altermagnetism broadens the scope of unconventional magnetism and opens routes to exploring emergent phenomena from real-space modulations of altermagnetic order.

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Cited by 6 Pith papers

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    cond-mat.mes-hall 2026-04 unverdicted novelty 7.0

    In d-wave altermagnets the leading intrinsic anomalous thermal Hall effect appears at third order in temperature gradient and is governed by a nonlinear thermal Berry-connection polarizability that encodes the quantum metric.

  2. G-type antiferromagnetic structure in Rb1-xV2Te2O

    cond-mat.mtrl-sci 2026-04 unverdicted novelty 7.0

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    Altermagnets intrinsically generate hundreds of high harmonics in spin and charge pumping under magnetic dynamics, with amplitudes exceeding light-driven schemes and without needing extra spin-orbit coupling.

  4. Antiferromagnetic Dimers in the Parent Phase of a Correlated Kagome Superconductor

    cond-mat.str-el 2026-04 unverdicted novelty 6.0

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    cond-mat.supr-con 2026-04 unverdicted novelty 6.0

    Pressure suppresses the density-wave feature in the d-wave altermagnet candidate CsV2Se2O and induces a reproducible, field-suppressible resistive downturn below 3 K suggestive of superconductivity.

  6. Robust $d$-wave altermagnetism in $\mathrm{RbCr_2Se_2O}$

    cond-mat.mtrl-sci 2026-04 unverdicted novelty 5.0

    RbCr2Se2O is predicted as a robust d-wave altermagnetic metal where in-plane uniaxial strain generates net magnetic moment via piezomagnetic effect, distinguishing G-type AFM.