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Enhanced electrical conductivity and diluted Ir4+ spin orders in electron doped iridates Sr2-xGaxIrO4.
- Source :
- Applied Physics Letters; 11/7/2016, Vol. 109 Issue 19, p192409-1-192409-5, 5p, 4 Graphs
- Publication Year :
- 2016
-
Abstract
- Sr<subscript>2</subscript>IrO<subscript>4</subscript> represents a fascinating system to study comparable electronic correlations and spin-orbit couplings, and recently attracts considerable attention in high-temperature superconductivity. Here, we report on the transport and magnetic properties in gallium-doped Sr<subscript>2</subscript>IrO<subscript>4</subscript>. A metallic state is discovered when doping x is over 0.1, which could be understood in terms of the quickly decreased energy gap and increased carrier concentration. In addition to the high-temperature magnetic transition (T<subscript>C</subscript>>200 K), a low-temperature one (T'<subscript>C</subscript> ) is also observed for the x=0.05-0.10 samples. Both of the magnetic states are found to be canted antiferromagnetism. The low-temperature phase is strongly depressed by doping and vanishes when doping is further increased, which is probably stabilized by the long-way exchange interactions of diluted Ir<superscript>4+</superscript> spins via Ir<superscript>3+</superscript> ions. Our studies provide an insight into the electrical and magnetic states tuned by chemical doping in Sr<subscript>2</subscript>IrO<subscript>4</subscript>, thereby facilitating the seeking of superconductivity in this system. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 109
- Issue :
- 19
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 119461523
- Full Text :
- https://doi.org/10.1063/1.4967699