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537 results on '"Lu, Zhong‐Yi"'

211. Tuning the Mottness in Sr3Ir2O7 via Bridging Oxygen Vacancies.

Author

Xu, Miao, Zou, Changwei, Gong, Benchao, Jia, Ke, Ye, Shusen, Hao, Zhenqi, Liu, Kai, Shi, Youguo, Lu, Zhong-Yi, Cai, Peng, and Wang, Yayu

Subjects
SCANNING tunneling microscopy, ATOMIC structure, SCANNING probe microscopy, BRIDGE defects, OXYGEN
Abstract

The electronic evolution of Mott insulators into exotic correlated phases remains puzzling, because of electron interaction and inhomogeneity. Introduction of individual imperfections in Mott insulators could help capture the main mechanism and serve as a basis to understand the evolution. Here we utilize scanning tunneling microscopy to probe the atomic scale electronic structure of the spin-orbit-coupling assisted Mott insulator Sr3Ir2O7. It is found that the tunneling spectra exhibit a homogeneous Mott gap in defect-free regions, but near the oxygen vacancy in the rotated IrO2 plane the local Mott gap size is significantly enhanced. We attribute the enhanced gap to the locally reduced hopping integral between the 5 d electrons of neighboring Ir sites via the bridging planar oxygen p orbitals. Such bridging defects have a dramatic influence on local bandwidth, thus provide a new way to manipulate the strength of Mottness in a Mott insulator. [ABSTRACT FROM AUTHOR]

Published
2023
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229. Distinct superconducting behaviors of pressurized WB2 and ReB2 with different local B layers.

Author

Pei, Cuiying, Zhang, Jianfeng, Gong, Chunsheng, Wang, Qi, Gao, Lingling, Zhao, Yi, Tian, Shangjie, Cao, Weizheng, Li, Changhua, Lu, Zhong-Yi, Lei, Hechang, Liu, Kai, and Qi, Yanpeng

Abstract

The recent discovery of superconductivity up to 32 K in the pressurized MoB2 reignites the interest in exploring high-Tc superconductors in transition-metal diborides. Inspired by that work, we turn our attention to the 5d transition-metal diborides. Here we systematically investigate the responses of both structural and physical properties of WB2 and ReB2 to external pressure, which possess different types of boron layers. Similar to MoB2, the pressure-induced superconductivity was also observed in WB2 above 60 GPa with a maximum Tc of 15 K at 100 GPa, while no superconductivity was detected in ReB2 in this pressure range. Interestingly, the structures at ambient pressure for both WB2 and ReB2 persist to high pressure without structural phase transitions. Theoretical calculations suggest that the ratio of flat boron layers in this class of transition-metal diborides may be crucial for the appearance of high Tc. The combined theoretical and experimental results highlight the effect of the geometry of boron layers on superconductivity and shed light on the exploration of novel high-Tc superconductors in borides. [ABSTRACT FROM AUTHOR]

Published
2022
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