Structure-Spin-Transport Anomaly in Quasi-One-Dimensional Ba9Fe3Te15under High Pressure

Jun Zhang, Mei Ling Jin, Xiang Li, Xian Cheng Wang*, Jian Fa Zhao, Ying Liu, Lei Duan, Wen Min Li, Li Peng Cao, Bi Juan Chen, Li Juan Wang, Fei Sun, Yong Gang Wang, Liu Xiang Yang, Yu Ming Xiao, Zheng Deng, Shao Min Feng, Chang Qing Jin, Jin Long Zhu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Recently, a series of novel compounds Ba3MX5 (M = Fe, Ti, V; X = Se, Te) with hexagonal crystal structures composed of quasi-1-dimensional (1D) magnetic chains has been synthesized by our research team using high-pressure and high-temperature methods. The initial hexagonal phases persist to the maximum achievable pressure, while spin configurations and magnetic interactions may change dramatically as a result of considerable reductions in interchain separations upon pressurization. These compounds therefore offer unique possibilities for studying the evolution of intrinsic electronic structures in quasi-1D magnetic systems. Here we present a systematic investigation of Ba9Fe3Te15, in which the interchain separations between trimerized 1D chains (∼ 10.2 Å) can be effectively modulated by external high pressure. The crystal structure especially along the 1D chains exhibits an abnormal expansion at ∼5 GPa, which accompanies trimerization entangled anomalous mixed-high-low spin transition. An insulator-metal transition has been observed under high pressure as a result of charge-transfer gap closing. Pressure-induced superconductivity emerges at 26 GPa, where the charge-transfer gap fully closes, 3D electronic configuration forms and local spin fully collapses.

Original languageEnglish
Article number087106
JournalChinese Physics Letters
Volume37
Issue number8
DOIs
Publication statusPublished - Aug 2020

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