Quantum fluctuations associated with a first-order magnetic transition in the frustrated kagome lattice antiferromagnet <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">N</mi><msub><mi mathvariant="normal">d</mi><mn>3</mn></msub><mi>ScB</mi><msub><mi mathvariant="normal">i</mi><mn>5</mn></msub></mrow></math>

Zhongchen Xu; Xinyang Liu; Cuiwei Zhang; Shuai Zhang; Feng Jin; Junsen Xiang; Quansheng Wu; Xianmin Zhang; Peijie Sun; Youguo Shi

doi:10.1103/xzhf-s6hp

Quantum fluctuations associated with a first-order magnetic transition in the frustrated kagome lattice antiferromagnet $N d_{3} ScB i_{5}$

Zhongchen Xu^1,2,3,*, Xinyang Liu^1,4,*, Cuiwei Zhang^1,2, Shuai Zhang^1,5, Feng Jin¹, Junsen Xiang^1,5, Quansheng Wu^1,5,6, Xianmin Zhang^3,†, Peijie Sun^1,5,6,‡ et al.

Youguo Shi^1,2,6,§

¹Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
²Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
³Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China
⁴School of Physics, Beihang University, Beijing 100191, China
⁵School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
⁶Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

^*These authors contributed equally to this work.
^†Contact author: zhangxm@atm.neu.edu.cn
^‡Contact author: pjsun@iphy.ac.cn
^§Contact author: ygshi@iphy.ac.cn

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Phys. Rev. B 113, 054421 – Published 12 February, 2026

DOI: https://doi.org/10.1103/xzhf-s6hp

Abstract

Intense quantum fluctuations arising from geometrical frustrations in kagome lattice magnets provide a feasible approach to exotic quantum states. Here, we document an unexpected isosymmetric first-order magnetic transition in the recently synthesized frustrated kagome lattice antiferromagnet $N d_{3} ScB i_{5}$ , which is characterized by significant latent heat and a pronounced magnetocaloric effect, as well as discontinuous Raman shifts and negligible hysteresis. Employing the magnetocaloric effect as a detection method, in conjunction with systematical field-dependent physical properties, we uncover a distinctive 1/2 magnetization plateau phase with significant quantum fluctuations. Our study unveils $N d_{3} ScB i_{5}$ as a prototypical model with an emerging phase of enhanced quantum fluctuations triggered by first-order magnetic transitions.

Physical Review B

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Quantum fluctuations associated with a first-order magnetic transition in the frustrated kagome lattice antiferromagnet $N d_{3} ScB i_{5}$

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Quantum fluctuations associated with a first-order magnetic transition in the frustrated kagome lattice antiferromagnet Nd3ScBi5

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Quantum fluctuations associated with a first-order magnetic transition in the frustrated kagome lattice antiferromagnet $N d_{3} ScB i_{5}$