Robust Metal-Insulator Transition Despite Surface Dead-Layer Growth in Sub-10-nm Cr-Doped V2O3 Nanocrystals
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911628248743936 |
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| author | Ishiwata, Yoichi Harada, Ichidai Imamura, Masaki Takahashi, Kazutoshi Ishii, Hirofumi Yoshimura, Masato Hiraoka, Nozomu Inagaki, Yuji Akashi, Kenta Kawae, Tatsuya Kida, Tetsuya Nantoh, Masashi |
| author_facet | Ishiwata, Yoichi Harada, Ichidai Imamura, Masaki Takahashi, Kazutoshi Ishii, Hirofumi Yoshimura, Masato Hiraoka, Nozomu Inagaki, Yuji Akashi, Kenta Kawae, Tatsuya Kida, Tetsuya Nantoh, Masashi |
| contents | We investigated the size dependence of the metal-insulator transition (MIT) in Cr-doped V2O3 nanocrystals by photoemission spectroscopy using complementary probing depths, together with magnetic susceptibility measurements. Photoemission spectra show that MIT signatures persist down to an average particle size of 5.6 nm, and magnetic susceptibility measurements exhibit a nearly size-invariant transition onset. The contrast between surface-sensitive and deeper-probing photoemission spectra reveals that the transition survives in the nanocrystal interior. At the same time, the spectra indicate a systematic suppression of coherent quasiparticle weight with decreasing size, pointing to the growth of an insulating surface dead layer. These results demonstrate that nanoscaling does not intrinsically eliminate the MIT itself, but progressively enhances the influence of surface-driven insulating behavior, thereby providing insight into the practical limits of miniaturizing Mott-based devices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_25488 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Robust Metal-Insulator Transition Despite Surface Dead-Layer Growth in Sub-10-nm Cr-Doped V2O3 Nanocrystals Ishiwata, Yoichi Harada, Ichidai Imamura, Masaki Takahashi, Kazutoshi Ishii, Hirofumi Yoshimura, Masato Hiraoka, Nozomu Inagaki, Yuji Akashi, Kenta Kawae, Tatsuya Kida, Tetsuya Nantoh, Masashi Strongly Correlated Electrons Mesoscale and Nanoscale Physics We investigated the size dependence of the metal-insulator transition (MIT) in Cr-doped V2O3 nanocrystals by photoemission spectroscopy using complementary probing depths, together with magnetic susceptibility measurements. Photoemission spectra show that MIT signatures persist down to an average particle size of 5.6 nm, and magnetic susceptibility measurements exhibit a nearly size-invariant transition onset. The contrast between surface-sensitive and deeper-probing photoemission spectra reveals that the transition survives in the nanocrystal interior. At the same time, the spectra indicate a systematic suppression of coherent quasiparticle weight with decreasing size, pointing to the growth of an insulating surface dead layer. These results demonstrate that nanoscaling does not intrinsically eliminate the MIT itself, but progressively enhances the influence of surface-driven insulating behavior, thereby providing insight into the practical limits of miniaturizing Mott-based devices. |
| title | Robust Metal-Insulator Transition Despite Surface Dead-Layer Growth in Sub-10-nm Cr-Doped V2O3 Nanocrystals |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.25488 |