Quaternary antiferromagnetic Ba2BiFeS5 with isolated FeS4 tetrahedra  

作　　者：Shaohua Wang Xiao Zhang Hechang Lei 王少华;张晓;雷和畅(Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices,Renmin University of China,Beijing 100872,China;State Key Laboratory of Information Photonics and Optical Communications & School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices,Renmin University of China,Beijing 100872,China [2]State Key Laboratory of Information Photonics and Optical Communications & School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Chinese Physics B》2019年第8期329-332,共4页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0300504);the National Natural Science Foundation of China(Grant Nos.11574394,11774423,and 11822412);the Fundamental Research Funds for the Central Universities;the Research Funds of Renmin University of China(RUC)(Grant Nos.15XNLQ07,18XNLG14,and 19XNLG17)

摘　　要：We report the detailed physical properties of quaternary compound Ba2BiFeS5 with the key structural ingredient of isolated FeS4 tetrahedra.Magnetization and heat capacity measurements clearly indicate that Ba2BiFeS5 has a paramagnetic to antiferromagnetic transition at about 30 K.The calculated magnetic entropy above ordering temperature is much smaller than theoretical value for high-spin Fe^3+ion with S=5/2,implying the possible short-range antiferromagnetic fluctuation in Ba2BiFeS5.We report the detailed physical properties of quaternary compound Ba2BiFeS5 with the key structural ingredient of isolated FeS4 tetrahedra. Magnetization and heat capacity measurements clearly indicate that Ba2BiFeS5 has a paramagnetic to antiferromagnetic transition at about 30 K. The calculated magnetic entropy above ordering temperature is much smaller than theoretical value for high-spin Fe3+ ion with S = 5/2, implying the possible short-range antiferromagnetic fluctuation in Ba2BiFeS5.

关 键 词：ISOLATED FeS4 TETRAHEDRA ANTIFERROMAGNETIC transition SHORT-RANGE ANTIFERROMAGNETIC FLUCTUATION 

分 类 号：O4[理学—物理]