Journal of the Korean Magnetics Society (한국자기학회지)

The Korean Magnetics Society (한국자기학회)
권호 표지
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Mössbauer Studies on Magnetoresistance in Chalcogenide Fe0.9M0.1Cr2S4 (M=Co, Ni, Zn)

Chalcogenide Fe0.9M0.1Cr2S4(M=Co, Ni, Zn)의 자기저항에 관한 Mössbauer 분광연구

  • 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)
  • 박재윤 (인천대학교 신소재공학과) ;
  • 이병섭 (ECR이온원/소형가속기 연구그룹, 한국기초과학지원연구원 부산센터)
  • Received : 2013.02.28
  • Accepted : 2013.03.14
  • Published : 2013.04.30
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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 $Cu_xFe_{1-x}Cr_2S_4$.

Chalcogenide $Fe_{0.9}M_{0.1}Cr_2S_4$(M=Co, Ni, Zn)에 대하여 X-선 회절법, 자기저항측정, Mossbauer 분광법을 이용하여 CMR특성과 자기적 성질을 연구하였다. 10 at%의 M 치환에서는 상온에서 입방정으로 정상 spinel 구조를 갖는 것으로 나타났다. 자기저항 실험결과 $T_C$ 부근에서는 도체-반도체 전이의 특성을 보이며 최대자기저항 온도가 나타났다. M$\ddot{o}$ssbauer 분광 실험 결과에서 Fe에 대한 Ni 치환은 초교환 상호작용을 강화시키고 Jahn-Teller 효과에 의한 완화 현상의 심화를 보여준다. CMR 특성은 망간산화물의 $Mn^{3+}$와 $Mn^{4+}$ 사이의 이중교환상호작용과 다르게 동적 Jahn-Teller 효과와 관계된 polaron에 기인한 도체-반도체 전이 의한 것으로 해석된다.

Keywords

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