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Pyrochlore iridates having metallic conductivity and their production method

外国特許コード F110005115
整理番号 A062-19US
掲載日 2011年8月23日
出願国 アメリカ合衆国
出願番号 36276203
公報番号 20030173549
公報番号 6946085
出願日 平成13年8月23日(2001.8.23)
公報発行日 平成15年9月18日(2003.9.18)
公報発行日 平成17年9月20日(2005.9.20)
国際出願番号 JP2001007234
国際公開番号 WO2002018274
国際出願日 平成13年8月23日(2001.8.23)
国際公開日 平成14年3月7日(2002.3.7)
優先権データ
  • 特願2000-260319 (2000.8.30) JP
  • 2001WO-JP07234 (2001.8.23) WO
発明の名称 (英語) Pyrochlore iridates having metallic conductivity and their production method
発明の概要(英語) (US6946085)
The present invention was made to develop a new material possessing simultaneously the two properties of geometrically frustrated state having a magnetic controllability and good conductivity which leads to applications for electrical controllability and thermal storage.
This object is achieved by the conductive material having the pyrochlore structure represented by the general formula R2Ir2O7, where R is a rare earth element or elements of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y.
When, especially, R is an element or elements of La, Ce, Pr, Nd, Pm, Sm and Eu, the material possesses metallic electrical conductivity, so that it is useful for magnetically controllable functional electronic materials and thermal storage materials having large thermal capacity.
特許請求の範囲(英語) [claim1]
1. A magnetic sensor used below the temperature of 10K wherein it uses a magnetically controllable pyrochlore material having electrical conductivity represented by a general formula R2Ir2O7, where R is an element or elements selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm and Eu.
[claim2]
2. A magnetic sensor used below the temperature of 10K wherein it uses a magnetically controllable pyrochlore material according to claim 1, wherein R consists of Pr.
[claim3]
3. A magnetic switching element used below the temperature of wherein it uses a magnetically controllable pyrochlore material having electrical conductivity represented by a general formula R2Ir2O7, where R is an element or elements selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm and Eu.
[claim4]
4. A magnetic switching element used below the temperature of 10K wherein it uses a magnetically controllable pyrochlore material according to claim 3, wherein R consists of Pr.
[claim5]
5. A magnetic memory element used below the temperature of 10K wherein it uses a magnetically controllable pyrochlore material having electrical conductivity represented by a general formula R2Ir2O7, where R is an element or elements selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm and Eu.
[claim6]
6. A magnetic memory element used below the temperature of 10K wherein it uses a magnetically controllable pyrochlore material according to claim 5, wherein R consists of Pr.
[claim7]
7. A thermal storage element for cryocoolers wherein it uses a magnetically controllable pyrochlore having electrical conductivity represented by a general formula R2Ir2O7, where R is an element or elements selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm and Eu.
[claim8]
8. A thermal storage element for cryocoolers wherein it uses a magnetically controllable pyrochlore material according to claim 7, wherein R consists of Pr.
  • 発明者/出願人(英語)
  • MAENO YOSHITERU
  • YANAGISHIMA DAIKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • C01G055/00
  • M01P006/40
参考情報 (研究プロジェクト等) CREST Phenomena of Extreme Conditions AREA
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