Evolution of magnetic and transport properties in pyrochlore iridates A2Ir2O7 (A=Y,Eu, Bi) |
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| Authors: | Hui Liu Dandan Liang Shiyun Chen Jian Bian Yuan Feng Baolong Fang |
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| Affiliation: | 1.Department of Mathematics and Physics,Hefei University,Anhui,China;2.High Magnetic Field Laboratory,Chinese Academy of Sciences/University of Science and Technology of China,Anhui,China;3.Analysis and Testing Center,Hefei University,Anhui,China |
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| Abstract: | We study the structure, magnetization, electrical transport properties and heat capacity of the pyrochlore iridates A2Ir2O7 (A=Y, Eu, Bi). It is found that magnetic frustration and long-range magnetic order coexist in Y2Ir2O7 and Eu2Ir2O7, while Bi2Ir2O7 shows magnetic frustration or short-range magnetic order without long-range magnetic order. The former two compounds show insulating behavior. However, the latter one shows metallic behavior. The variations of the radius of A-site ion affect the conduction bandwidth, correlation and Ir-Ir exchange energy, which in turn determine transport properties and magnetic properties. We also find that the antiferromagnetic ordering of pyrochlore iridates is weakly frustrated. The all-in/all-out type of anisotropy based on spin-orbit coupling plays a key role in releasing the frustration. |
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