Metal-insulator transition sustained by Cr-doping in V 2O 3 nanocrystals

Yoichi Ishiwata; Tatsuya Shiraishi; Naoki Ito; Satoshi Suehiro; Tetsuya Kida; Hirofumi Ishii; Yasuhisa Tezuka; Yuji Inagaki; Tatsuya Kawae; Hirotaka Oosato; Eiichiro Watanabe; Daiju Tsuya; Masashi Nantoh; Koji Ishibashi

doi:10.1063/1.3679396

Metal-insulator transition sustained by Cr-doping in V ₂O ₃ nanocrystals

Yoichi Ishiwata, Tatsuya Shiraishi, Naoki Ito, Satoshi Suehiro, Tetsuya Kida, Hirofumi Ishii, Yasuhisa Tezuka, Yuji Inagaki, Tatsuya Kawae, Hirotaka Oosato, Eiichiro Watanabe, Daiju Tsuya, Masashi Nantoh, Koji Ishibashi

Applied Physics

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We have obtained monodisperse (V _1-xCr _x) ₂O ₃ nanocrystals with crystal sizes of 21.0 ± 4.1 nm using organic-phase synthesis. The (V _1- _xCr _x) ₂O ₃ nanocrystals clearly show the transition from a corundum structured paramagnetic metal to a monoclinic structured antiferromagnetic insulator in contrast to non-doped V ₂O ₃ nanocrystals, in which the disappearance of the metal-insulator transition has been observed. We have found that Cr doping works effectively in narrowing the a _1g band, which tends to be broadened by nanocrystallization. This result suggests that chemical doping is useful for control of material phase transitions at the nanoscale.

Original language	English
Article number	043103
Journal	Applied Physics Letters
Volume	100
Issue number	4
DOIs	https://doi.org/10.1063/1.3679396
Publication status	Published - Jan 23 2012

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3679396

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@article{091eb3939b6e4bb484002b887f355525,

title = "Metal-insulator transition sustained by Cr-doping in V 2O 3 nanocrystals",

abstract = "We have obtained monodisperse (V 1-xCr x) 2O 3 nanocrystals with crystal sizes of 21.0 ± 4.1 nm using organic-phase synthesis. The (V 1- xCr x) 2O 3 nanocrystals clearly show the transition from a corundum structured paramagnetic metal to a monoclinic structured antiferromagnetic insulator in contrast to non-doped V 2O 3 nanocrystals, in which the disappearance of the metal-insulator transition has been observed. We have found that Cr doping works effectively in narrowing the a 1g band, which tends to be broadened by nanocrystallization. This result suggests that chemical doping is useful for control of material phase transitions at the nanoscale.",

author = "Yoichi Ishiwata and Tatsuya Shiraishi and Naoki Ito and Satoshi Suehiro and Tetsuya Kida and Hirofumi Ishii and Yasuhisa Tezuka and Yuji Inagaki and Tatsuya Kawae and Hirotaka Oosato and Eiichiro Watanabe and Daiju Tsuya and Masashi Nantoh and Koji Ishibashi",

note = "Funding Information: We gratefully acknowledge the help of M. Yoshimura at SPring-8 with the XRD experiment. We would also like to thank J. Adachi at KEK for assistance with the XAS experiments. This work was supported by the Iketani Science and Technology Foundation. ",

year = "2012",

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day = "23",

doi = "10.1063/1.3679396",

language = "English",

volume = "100",

journal = "Applied Physics Letters",

issn = "0003-6951",

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T1 - Metal-insulator transition sustained by Cr-doping in V 2O 3 nanocrystals

AU - Ishiwata, Yoichi

AU - Shiraishi, Tatsuya

AU - Ito, Naoki

AU - Suehiro, Satoshi

AU - Kida, Tetsuya

AU - Ishii, Hirofumi

AU - Tezuka, Yasuhisa

AU - Inagaki, Yuji

AU - Kawae, Tatsuya

AU - Oosato, Hirotaka

AU - Watanabe, Eiichiro

AU - Tsuya, Daiju

AU - Nantoh, Masashi

AU - Ishibashi, Koji

N1 - Funding Information: We gratefully acknowledge the help of M. Yoshimura at SPring-8 with the XRD experiment. We would also like to thank J. Adachi at KEK for assistance with the XAS experiments. This work was supported by the Iketani Science and Technology Foundation.

PY - 2012/1/23

Y1 - 2012/1/23

N2 - We have obtained monodisperse (V 1-xCr x) 2O 3 nanocrystals with crystal sizes of 21.0 ± 4.1 nm using organic-phase synthesis. The (V 1- xCr x) 2O 3 nanocrystals clearly show the transition from a corundum structured paramagnetic metal to a monoclinic structured antiferromagnetic insulator in contrast to non-doped V 2O 3 nanocrystals, in which the disappearance of the metal-insulator transition has been observed. We have found that Cr doping works effectively in narrowing the a 1g band, which tends to be broadened by nanocrystallization. This result suggests that chemical doping is useful for control of material phase transitions at the nanoscale.

AB - We have obtained monodisperse (V 1-xCr x) 2O 3 nanocrystals with crystal sizes of 21.0 ± 4.1 nm using organic-phase synthesis. The (V 1- xCr x) 2O 3 nanocrystals clearly show the transition from a corundum structured paramagnetic metal to a monoclinic structured antiferromagnetic insulator in contrast to non-doped V 2O 3 nanocrystals, in which the disappearance of the metal-insulator transition has been observed. We have found that Cr doping works effectively in narrowing the a 1g band, which tends to be broadened by nanocrystallization. This result suggests that chemical doping is useful for control of material phase transitions at the nanoscale.

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DO - 10.1063/1.3679396

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

M1 - 043103

ER -

Metal-insulator transition sustained by Cr-doping in V ₂O ₃ nanocrystals

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