| Item type |
学術雑誌論文 / Journal Article.(1) |
| 公開日 |
2007-09-26 |
| 書誌情報 |
en : Physical review. Third series. B, Condensed matter and materials physics
巻 58,
号 11,
p. 6844-6854,
発行日 1998-09-15
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| タイトル |
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|
タイトル |
Metal-insulator transition in the spinel-type CuIr2(S1-xSex)4 system |
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言語 |
en |
| 言語 |
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|
言語 |
eng |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
copper compounds |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
diamagnetic materials |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
electrical resistivity |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
iridium compounds |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
magnetic hysteresis |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
magnetic susceptibility |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
metal-insulator transition |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Mossbauer effect |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
paramagnetic materials |
| キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
solid-state phase transformations |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 著者 |
永田, 正一
MATSUMOTO, Nobuhiro
KATO, Yoshiaki
FURUBAYASHI, Takao
MATSUMOTO, Takehiko
SANCHEZ, Jean Pierre
VULLIET, Paul
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
The thiospinel CuIr2S4 exhibits a temperature-induced metal-insulator (M-I) transition around 226 K, showing hysteresis on heating and cooling, that manifests itself as a gap in the electronic density of state with increasing electrical resistivity at low temperatures. Conversely, CuIr2Se4 remains metallic down to 0.5 K. We have successfully synthesized the spinel-type compound CuIr2(S1-xSex)4 system. In order to see the effect of substitutions of Se at the S sites, we have carried out a systematic experimental study of structural, electrical, and magnetic properties of CuIr2(S1-xSex)4. Mössbauer spectroscopy measurements of 193Ir have been performed for CuIr2S4 and CuIr2Se4. The M-I transition of CuIr2(S1-xSex)4 for x⩽0.15 is accompanied by a structural transformation from tetragonal (low-temperature insulating phase) to cubic (high-temperature metallic phase) symmetry. With increasing Se concentration x, the sharp M-I transition shifts to lower temperature. The resistivity shows a monotonous increase with decreasing temperature for 0.17⩽x⩽0.78 between 4.2 and 300 K, and the metallic state is recovered for x⩾0.80. Magnetic susceptibility measurements show the jump at the M-I transition temperature with hysteresis on heating and cooling. The high-temperature metallic phase of CuIr2S4 shows Pauli paramagnetism, having a density of states at the Fermi level, D(ϵF)=0.67 states/eV atom. The insulating phase at low temperatures exhibits diamagnetism, and there is no localized magnetic moment. The Arrhenius regime is observed for the conductivity with a thermally activated process for 0⩽x⩽0.70 in the insulating phase. There is a general trend toward increasing metallicity with increasing x, which is consistent with the magnetic susceptibility results. A possibility of a two-site model of different valence states for Ir ions in the insulating phase of CuIr2S4 will be discussed on the basis of the Mössbauer data. A phase diagram of temperature versus Se concentration x will be proposed for the CuIr2(S1-xSex)4 system. The mechanism of the M-I transition remains enigmatic and is far from a complete picture |
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言語 |
en |
| 出版者 |
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出版者 |
The American Physical Society |
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言語 |
en |
| 出版者版へのリンク |
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表示名 |
10.1103/PhysRevB.58.6844 |
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URL |
https://doi.org/10.1103/PhysRevB.58.6844 |
| DOI |
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関連タイプ |
isIdenticalTo |
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識別子タイプ |
DOI |
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関連識別子 |
10.1103/PhysRevB.58.6844 |
| 論文ID（NAID） |
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関連タイプ |
isIdenticalTo |
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識別子タイプ |
NAID |
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関連識別子 |
120000801990 |
| 日本十進分類法 |
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主題Scheme |
NDC |
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主題 |
428.4 |
| ISSN |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
10980121 |
| 書誌レコードID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA11187113 |
| 権利 |
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言語 |
en |
|
権利情報 |
© 1998 The American Physical Society |
| 著者版フラグ |
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出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| フォーマット |
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内容記述タイプ |
Other |
|
内容記述 |
application/pdf |
PR-B_58_6844.pdf (273.8 kB)
