Cr-Doped TiSe2 鈥?A Layered Dichalcogenide Spin Glass

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• 作者：Huixia Luo ; Jason W. Krizan ; Elizabeth M. Seibel ; Weiwei Xie ; Girija S. Sahasrabudhe ; Susanna L. Bergman ; Brendan F. Phelan ; Jing Tao ; Zhen Wang ; Jiandi Zhang ; R. J. Cava
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：October 13, 2015
• 年：2015
• 卷：27
• 期：19
• 页码：6810-6817
• 全文大小：645K
• ISSN：1520-5002

文摘

We report the magnetic characterization of the Cr-doped layered dichalcogenide TiSe₂. The temperature dependent magnetic susceptibilities are typical of those seen in geometrically frustrated insulating antiferromagnets. The Cr moment is close to the spin-only value, and the Curie鈥揥eiss temperatures (胃_cw) are between 鈭?0 and 鈭?30 K. Freezing of the spin system, which is glassy, characterized by peaks in the ac and dc susceptibility and specific heat, does not occur until below T/胃_cw = 0.05. The CDW transition seen in the resistivity for pure TiSe₂ is still present for 3% Cr substitution but is absent by 10% substitution, above which the materials are metallic and p-type. Structural refinements, magnetic characterization, and chemical considerations indicate that the materials are of the type Ti_1鈥?i>xCr_xSe_2-x/2 for 0 鈮?x 鈮?0.6.