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Band structures, magnetic properties, and enhanced magnetoresistance in the high pressure phase of Gd and Y doped two-dimensional perovskite Sr2CoO4 compounds

Journal Article


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Abstract


  • The authors present their studies on the band structures and on the magnetic and magnetotransport properties of the high pressure phase of Sr2xRExCoO4 [rare earth (RE)=Gd and Y, x=0.10.5] compounds which were synthesized by a high pressure and high temperature technique. The authors found that as x increases, the magnetoresistance {(rhoHrho0)/rho0} increases up to 17% at 5 K and 7 T, which is 2.5 times higher than that for undoped Sr2CoO4, although the ferromagnetic transition drops from 255 to 200 K for the Gd doping with x=0.3. The saturation moments at low temperature are significantly enhanced for the Gd doped Sr2CoO4. Observation of a close correlation between resistance and field revealed a strong spin-dependent tunneling magnetoresistance. First-principles band structure calculations indicate that high spin polarization is present for both undoped and doped compounds. é2007 American Institute of Physics

Publication Date


  • 2007

Citation


  • Wang, X., Takayama-Muromachi, E., Dou, S. Xue. & Cheng, Z. (2007). Band structures, magnetic properties, and enhanced magnetoresistance in the high pressure phase of Gd and Y doped two-dimensional perovskite Sr2CoO4 compounds. Applied Physics Letters, 91 (6), 062501-1-062501-3.

Scopus Eid


  • 2-s2.0-34547842590

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1242&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/243

Has Global Citation Frequency


Start Page


  • 062501-1

End Page


  • 062501-3

Volume


  • 91

Issue


  • 6

Abstract


  • The authors present their studies on the band structures and on the magnetic and magnetotransport properties of the high pressure phase of Sr2xRExCoO4 [rare earth (RE)=Gd and Y, x=0.10.5] compounds which were synthesized by a high pressure and high temperature technique. The authors found that as x increases, the magnetoresistance {(rhoHrho0)/rho0} increases up to 17% at 5 K and 7 T, which is 2.5 times higher than that for undoped Sr2CoO4, although the ferromagnetic transition drops from 255 to 200 K for the Gd doping with x=0.3. The saturation moments at low temperature are significantly enhanced for the Gd doped Sr2CoO4. Observation of a close correlation between resistance and field revealed a strong spin-dependent tunneling magnetoresistance. First-principles band structure calculations indicate that high spin polarization is present for both undoped and doped compounds. é2007 American Institute of Physics

Publication Date


  • 2007

Citation


  • Wang, X., Takayama-Muromachi, E., Dou, S. Xue. & Cheng, Z. (2007). Band structures, magnetic properties, and enhanced magnetoresistance in the high pressure phase of Gd and Y doped two-dimensional perovskite Sr2CoO4 compounds. Applied Physics Letters, 91 (6), 062501-1-062501-3.

Scopus Eid


  • 2-s2.0-34547842590

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1242&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/243

Has Global Citation Frequency


Start Page


  • 062501-1

End Page


  • 062501-3

Volume


  • 91

Issue


  • 6