Insulator-metal transition in deep Sr-vacant spin-orbit Mott insulator S2IrO4

Insulator-metal transition in deep Sr-vacant spin-orbit Mott insulator S2IrO4
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深 Sr 空位自旋轨道莫特绝缘体 S2IrO4 中的绝缘体-金属转变

DOI:
10.1016/j.jallcom.2016.06.110
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发表时间:
2016-12
影响因子:
6.2
通讯作者:
Wang Z. H.
Wang Z. H.
中科院分区:
材料科学2区
文献类型:
--
作者:
Sun Xuanyong;Liu S. L.;Wang Haiyun;Li Bin;Cheng Jie;Wang Z. H.

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摘要S r2IrO4显示出一种新的自旋-轨道相互作用辅助的绝缘态。合成了一系列S r2−xIrO4多晶样品。结果表明,S r2−xIrO4中的深空位大大降低了IrO6八面体的旋转,更重要的是,在x=0.4 8附近,晶格常数和Ir−O2键长都发生了显著的结构变化.在S r2−x Ir O4的x>0.48处,出现了绝缘体-金属相变,并证明了非费米液态金属电子态。此外,S r1.5 Ir O4的局域化温度T0和反铁磁相变温度TN突然下降,居里-魏氏温度反转。这些突变与旋光晶体结构的减少密切相关。
Abstract S r 2 I r O 4 exhibits a novel insulating state assisted by spin-orbit interactions. A series of polycrystalline samples of S r 2− x I r O 4 have been synthesized. It is found that deep Sr-vacancies of S r 2− x I r O 4 greatly reduce the rotation of I r O 6 octahedral, and more importantly, a significant structural change occurs around x= 0.48 in both the lattice constants and the I r− O 2 bond length. An insulator-metal transition (IMT) appears and a non-Fermi-liquid metallic electronic state has been proved at x> 0.48 in S r 2− x I r O 4. Furthermore, a sudden drop emerges of the localization temperature T 0 and the antiferromagnetic (AFM) transition temperature T N in S r 1.5 I r O 4, together with the Curie-Weiss temperature reversing its sign. These abrupt changes are closely related with the reduction of the rotation crystal structure.
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