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Topological Magnon Band Crossing in $Y_{2} {Ir}_{2} O_{7}$

https://doi.org/10.1103/physrevlett.127.267203

Nguyen, Thi Huyen; Son, Jaeseok; Kim, Soyeun; Cho, Hwanbeom; Kim, Choong H.; Wang, Y. P.; Burch, Kenneth S.; Yang, In-Sang; Jeong, Jaehong; Park, Je-Geun; et al (December 2021, Physical Review Letters)

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Air-Stable and Layer-Dependent Ferromagnetism in Atomically Thin van der Waals CrPS ₄

https://doi.org/10.1021/acsnano.1c07860

Son, Joolee; Son, Suhan; Park, Pyeongjae; Kim, Maengsuk; Tao, Zui; Oh, Juhyun; Lee, Taehyeon; Lee, Sanghyun; Kim, Junghyun; Zhang, Kaixuan; et al (October 2021, ACS Nano)

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Magnetism in two-dimensional van der Waals materials

https://doi.org/10.1038/s41586-018-0631-z

Burch, Kenneth S.; Mandrus, David; Park, Je-Geun (November 2018, Nature)

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Field-induced quantum spin disordered state in spin-1/2 honeycomb magnet Na2Co2TeO6

https://doi.org/10.1038/s41467-021-25567-7

Lin, Gaoting; Jeong, Jaehong; Kim, Chaebin; Wang, Yao; Huang, Qing; Masuda, Takatsugu; Asai, Shinichiro; Itoh, Shinichi; Günther, Gerrit; Russina, Margarita; et al (December 2021, Nature Communications)

Abstract Spin-orbit coupled honeycomb magnets with the Kitaev interaction have received a lot of attention due to their potential of hosting exotic quantum states including quantum spin liquids. Thus far, the most studied Kitaev systems are 4 d /5 d -based honeycomb magnets. Recent theoretical studies predicted that 3 d -based honeycomb magnets, including Na 2 Co 2 TeO 6 (NCTO), could also be a potential Kitaev system. Here, we have used a combination of heat capacity, magnetization, electron spin resonance measurements alongside inelastic neutron scattering (INS) to study NCTO’s quantum magnetism, and we have found a field-induced spin disordered state in an applied magnetic field range of 7.5 T < B (⊥ b -axis) < 10.5 T. The INS spectra were also simulated to tentatively extract the exchange interactions. As a 3 d -magnet with a field-induced disordered state on an effective spin-1/2 honeycomb lattice, NCTO expands the Kitaev model to 3 d compounds, promoting further interests on the spin-orbital effect in quantum magnets.
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