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http://dx.doi.org/10.4283/JKMS.2013.23.2.043

Mössbauer Studies on Magnetoresistance in Chalcogenide Fe0.9M0.1Cr2S4 (M=Co, Ni, Zn)  

Park, Jae Yun (Dept. of Materials Science and Engineering, Incheon National University)
Lee, Byoung-Seob (ECR Ion Source/Compact Linear Accelerator Group, Korea Basic Science Institute Busan Center)
Publication Information
Journal of the Korean Magnetics Society / v.23, no.2, 2013 , pp. 43-48 More about this Journal
Abstract
The Jahn-Teller distortion of chalcogenide $Fe_{0.9}M_{0.1}Cr_2S_4$ (M=Co, Ni, Zn) have been investigated by M$\ddot{o}$ssbauer spectroscopy. The crystal structures of $Fe_{0.9}M_{0.1}Cr_2S_4$ (M=Co, Ni, Zn) are cubic spinel at room temperature. Magnetoresistance measurements indicate these system is conducting-semiconducting transistion around $T_C$. Below $T_C$, the asymmetric line broadening is observed and considered to be dynamic Jahn-Teller distortion. Isomer shift value of the samples at room temperature was about 0.5 mm/s, which means that charge state of Fe ions is ferrous in character. The Ni substitutions for Fe occur to increase the Jahn-Teller relaxation. CMR properties could be explained with magnetic polaron due to Jahn-Teller effect, which is different from both the double exchange interactions of manganite system and the triple exchange interactions of chalcogenide $Cu_xFe_{1-x}Cr_2S_4$.
Keywords
M$\ddot{o}$ssbauer; CMR; chalcogenide; polaron; Jahn-Teller; spinel;
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