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Pyrochlore iridates having metallic conductivity and their production method

Foreign code F110005115
File No. A062-19US
Posted date Aug 23, 2011
Country United States of America
Application number 36276203
Gazette No. 20030173549
Gazette No. 6946085
Date of filing Aug 23, 2001
Gazette Date Sep 18, 2003
Gazette Date Sep 20, 2005
International application number JP2001007234
International publication number WO2002018274
Date of international filing Aug 23, 2001
Date of international publication Mar 7, 2002
Priority data
  • P2000-260319 (Aug 30, 2000) JP
  • 2001WO-JP07234 (Aug 23, 2001) WO
Title Pyrochlore iridates having metallic conductivity and their production method
Abstract (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.
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • MAENO YOSHITERU
  • YANAGISHIMA DAIKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) CREST Phenomena of Extreme Conditions AREA
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