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Crystal structure and properties of iron-based spin-chain compound Ba9Fe3Se15

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arxiv 2102.03708 v1 pith:WEHQQZ7F submitted 2021-02-07 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

Jun Zhang , Alexander C. Komarek , Meiling Jin , Xiancheng Wang , Yating Jia , Jianfa Zhao , Wenmin Li , Zhiwei Hu
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Wei Peng L.H. Tjeng Zheng Deng Runze Yu Shaomin Feng Sijia Zhang Min Liu Yi-feng Yang Hong-ji Lin Chien-Te Chen Xiaodong Li Jinlong Zhu Changqing Jin
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classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
keywords highba9fe3se15pressurespinstateambientstructureaccompanied
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We report the synthesis of a new quasi one-dimensional (1D) iron selenide. Ba9Fe3Se15 was synthesized at high temperature and high pressure of 5.5 GPa and systematically studied via structural, magnetic and transport measurements at ambient and at high-pressures. Ba9Fe3Se15 crystallizes in a monoclinic structure and consists of face-sharing FeSe6 octahedral chains along the c axis. At ambient pressure it exhibits an insulating behavior with a band gap ~460 meV and undergoes a ferrimagnet-like phase transition at 14 K. Under high pressure, a complete metallization occurs at ~29 GPa, which is accompanied by a spin state crossover from high spin (HS) state to low spin (LS) state. The LS appears for pressures P >36 GPa.

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