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Klein, Dahlia

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Klein

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Dahlia

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Klein, Dahlia

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20192

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Author's Publications: search.filters.isAuthorOfPublication.55a7dcc6-cbbb-400e-b0ae-08f4b3f15b1f

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    Enhancement of Interlayer Exchange in an Ultrathin Two-Dimensional Magnet
    (Springer Science and Business Media LLC, 2019-09-16) Klein, Dahlia; MacNeill, David; Song, Qian; Larson, Daniel; Fang, Shiang; Xu, Mingyu; Ribeiro, R. A.; Canfield, P. C.; Kaxiras, Efthimios; Comin, Riccardo; Jarillo-Herrero, Pablo
    Following the recent isolation of monolayer CrI3 [1], there has been a surge of new two-dimensional van der Waals magnetic materials [2-12], whose incorporation in van der Waals heterostructures offers a new platform for spintronics [5-9], proximity magnetism [13], and quantum spin liquids [14]. A primary question in this burgeoning field is how exfoliating crystals to the few-layer limit influences their magnetism. Studies on CrI3 have shown a different magnetic ground state for ultrathin exfoliated films [1,5,6] but the origin is not yet understood. Here, we use electron tunneling through few-layer crystals of the layered antiferromagnetic insulator CrCl3 to probe its magnetic order, finding a ten-fold enhancement in the interlayer exchange compared to bulk crystals. Moreover, temperature- and polarization-dependent Raman spectroscopy reveal that the crystallographic phase transition of bulk crystals does not occur in exfoliated films. This results in a different low temperature stacking order and, we hypothesize, increased interlayer exchange. Our study provides new insight into the connection between stacking order and interlayer interactions in novel two-dimensional magnets, which may be relevant for correlating stacking faults and mechanical deformations with the magnetic ground states of other more exotic layered magnets, such as RuCl3 [14].
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    Publication
    Enhancement of Interlayer Exchange in an Ultrathin Two-Dimensional Magnet
    (Springer Science and Business Media LLC, 2019-09-16) Song, Qian; Fang, Shiang; Xu, Mingyu; Ribeiro, R. A.; Canfield, P. C.; Kaxiras, Efthimios; Comin, Riccardo; Jarillo-Herrero, Pablo; Klein, Dahlia; MacNeill, David; Larson, Daniel; Canfield, P
    Following the recent isolation of monolayer CrI3, many more two-dimensional van der Waals magnetic materials have been isolated. Their incorporation in van der Waals heterostructures offers a new platform for spintronics proximity magnetism and quantum spin liquids. A primary question in this field is how exfoliating crystals to the few-layer limit influences their magnetism. Studies of CrI3 have shown a different magnetic ground state for ultrathin exfoliated films compared with the bulk, but the origin is not yet understood. Here, we use electron tunnelling through few-layer crystals of the layered antiferromagnetic insulator CrCl3 to probe its magnetic order and find a tenfold enhancement of the interlayer exchange compared with bulk crystals. Moreover, temperature- and polarization-dependent Raman spectroscopy reveals that the crystallographic phase transition of bulk crystals does not occur in exfoliated films. This results in a different low-temperature stacking order and, we hypothesize, increased interlayer exchange. Our study provides insight into the connection between stacking order and interlayer interactions in two-dimensional magnets, which may be relevant for correlating stacking faults and mechanical deformations with the magnetic ground states of other more exotic layered magnets such as RuCl3.