Non-monotonic effect of the electronic transport and magnetic properties in a Sm-doped Sr 2−x Sm x IrO 4 system
| Autor: | Chaomin Zhu, Peng Dong, Shengli Liu, Bin Li, Jie Cheng, Z. H. Wang |
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| Rok vydání: | 2018 |
| Předmět: |
High concentration
Materials science Condensed matter physics Doping General Physics and Astronomy Monotonic function 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic exchange Molecular geometry Octahedron Electrical resistivity and conductivity 0103 physical sciences Antiferromagnetism 010306 general physics 0210 nano-technology |
| Zdroj: | EPL (Europhysics Letters). 124:17004 |
| ISSN: | 1286-4854 |
| DOI: | 10.1209/0295-5075/124/17004 |
| Popis: | Sr2 IrO4 has been shown to host a novel Mott spin-orbit insulating state with antiferromagnetic ordering. Here, the effects of Sm substitution at Sr-site on structural, electrical and magnetic properties are studied in Sr2 IrO4 . Sm-doped samples still retain the insulating behavior, but with the increase of Sm-doping concentration x , the resistivity firstly decreases for and then increases. We found that the increment of the Ir-O-Ir bond angle, combined with the modulation of the regularity of IrO6 octahedra, results in the non-monotonic variation of resistivity with x . On the other hand, there are two types of magnetic exchange interactions (i.e. , Ir4+ -O-Ir4+ and Sm3+ -O-Ir4+ ) in the Sm-doped Sr2−x Smx IrO4 system. The antiferromagnetic component is greatly suppressed in the low concentration x and then an ascension emerges in the high concentration x , which is attributable to the competition between the weakened Ir4+ -O-Ir4+ and enhanced Sm3+ -O-Ir4+ exchange interactions. |
| Databáze: | OpenAIRE |
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