Temperature- and Pressure-Induced Spin Crossover in Co1+xCr2–xSe4 (x = 0.24): A Diffraction Study

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• 作者：V. Svitlyk ; D. Chernyshov ; Y. Mozharivskyj ; F. Yuan ; O. Zaharko ; M. Mezouar
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：January 4, 2016
• 年：2016
• 卷：55
• 期：1
• 页码：338-344
• 全文大小：474K
• ISSN：1520-510X

文摘

The Co²⁺ ions of the Co_1+xCr_2–xSe₄ phase (Co_1.24Cr_1.76Se₄ composition with x = 0.24, C2/m space group, Cr₃S₄-type structure) undergo a high- to low-spin-state transition around 230 K, as concluded from the temperature-dependent single-crystal synchrotron radiation diffraction experiments and the previously reported physical property studies. The change of the spin state is not instantaneous and goes through a wide spin-crossover (SCO) region of 75 K. A similar Co²⁺ high- to low-spin-state transition is suggested at a pressure of 14.5 GPa, as is evident from the pressure-dependent single-crystal synchrotron radiation diffraction experiments. The corresponding SCO region is equal to 5 GPa, and the structural behavior is different from the one observed during the temperature-dependent transition. Coupling between the spin-conversion process in Co_1+xCr_2–xSe₄ and the concomitant changes in the physical properties opens a way for a controlled tuning of the observed physical response through compositional and structural modifications.