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For RO2\u003c0.24 SCCM (sccm denotes cubic centimeter per minute), the resistivity revealed a minimum and showed In T dependence at lower temperatures, probably due to the weak localization of conduction electrons owing to presence of thin oxide shells covering Co cores. A small negative magnetoresistance was observed in this regime. For RO2\u003e0.3 SCCM, tunnel-type temperature dependence of σ in the form of ln σ vs 1/T was observed between 7 and 80 K. This differs from the well-known temperature dependence of ln σ vs 1/T1/2 for disordered granular materials. The magnetoresistance ratio, (ρH=30 kOe-ρ0)/ρ0, is negative and its absolute value increases sharply with decreasing temperature below 25 K: from 3.5% at 25 K to 20.5% at 4.2 K. This marked increase, by a factor of 6, is much larger than those observed for conventional metal-insulator granular systems. 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Characteristic transport properties of CoO-coated monodispersive Co cluster assemblies
https://nitech.repo.nii.ac.jp/records/4713
https://nitech.repo.nii.ac.jp/records/4713a5731b82-8a7c-449d-bf68-c3cdb8e6d662
名前 / ファイル | ライセンス | アクション |
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本文_fulltext (485.2 kB)
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(c)1999 The American Physical Society
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2012-11-06 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Characteristic transport properties of CoO-coated monodispersive Co cluster assemblies | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Peng, D. L.
× Peng, D. L.× Sumiyama, Kenji× Konno, T. J.× Hihara, Takehiko× Yamamuro, S. |
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著者別名 | ||||||
姓名 | 隅山, 兼治 | |||||
著者別名 | ||||||
姓名 | 日原, 岳彦 | |||||
書誌情報 |
PHYSICAL REVIEW B 巻 60, 号 3, p. 2093-2100, 発行日 1999-07-15 |
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出版者 | ||||||
出版者 | American Physical Society | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 10980121 | |||||
書誌レコードID(NCID) | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11187113 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | We have fabricated CoO-coated monodispersive Co cluster assemblies with the mean cluster size of 13 nm at various oxygen gas-flow rate RO2 by a plasma-gas-condensation-type cluster beam deposition technique, and studied their electrical conductivity, σ, and magnetoresistance. For RO2<0.24 SCCM (sccm denotes cubic centimeter per minute), the resistivity revealed a minimum and showed In T dependence at lower temperatures, probably due to the weak localization of conduction electrons owing to presence of thin oxide shells covering Co cores. A small negative magnetoresistance was observed in this regime. For RO2>0.3 SCCM, tunnel-type temperature dependence of σ in the form of ln σ vs 1/T was observed between 7 and 80 K. This differs from the well-known temperature dependence of ln σ vs 1/T1/2 for disordered granular materials. The magnetoresistance ratio, (ρH=30 kOe-ρ0)/ρ0, is negative and its absolute value increases sharply with decreasing temperature below 25 K: from 3.5% at 25 K to 20.5% at 4.2 K. This marked increase, by a factor of 6, is much larger than those observed for conventional metal-insulator granular systems. These results are ascribed to a prominent cotunneling effect in the Coulomb blockade regime, arising from the uniform Co core size and CoO shell thickness in the present monodispersed cluster assemblies. | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf |