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Crystal structures and property characterization of two magnetic frustration compounds

Published online by Cambridge University Press:  10 August 2018

Kunkun Li ,
Duanduan Yuan ,
Shijie Shen  and
Jiangang Guo
Kunkun Li
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China University of Chinese Academy of Sciences, Beijing 100049, China
Duanduan Yuan
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China University of Chinese Academy of Sciences, Beijing 100049, China
Shijie Shen
Affiliation:
Department of Physics & Electronic Engineering, Taizhou University, Taizhou 318000, China
Jiangang Guo*
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
*
a)Author to whom correspondence should be addressed. Electronic mail: jgguo@iphy.ac.cn
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Abstract

We report the structure and physical properties of two quasi-two-dimensional triangular antiferromagnetic materials, Co0.66Al2Se3.53 and Ni0.61Al2Se3.55, which show highly magnetically frustrated characters. Powder X-ray diffractions demonstrate that Co0.66Al2Se3.53 and Ni0.61Al2Se3.55 possess identical space group of P-3m1 with lattice parameters a = 3.8089(1) Å, c = 12.676(1) Å and a = 3.7880(1) Å, c = 12.650(1) Å, respectively. Analyzing the susceptibility data of Co0.66Al2Se3.53 reveal a Curie Weiss temperature of −216 K, and a spin-freezing transition temperature of 4.5 K, giving a frustration index f = −θcw/Tf ≈ 48. Ni0.61Al2Se3.55 possesses an effective moment of 2.38 µB, a Curie–Weiss temperature of −62 K with no sign of spin-freezing transition down to 2 K. The AC susceptibility data of Co0.66Al2Se3.53 suggest a spin glass-like transition, but no intersite mixing between Co2+ and Al3+ was observed from the X-ray photoelectron spectroscopy measurements.

Keywords

geometrical frustrationtriangular latticepowder diffractionRietveld refinementspin freezing
Type
Technical Article
Information
Powder Diffraction , Volume 33 , Issue 3 , September 2018 , pp. 190 - 194
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Copyright
Copyright © International Centre for Diffraction Data 2018 

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