Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Metal-Insulator Transition Induced by Short Range Magnetic Ordering in Mono-layered Manganite

  • Chi, E.O. (Center for CMR Materials, Korea Research Institute of Standards and Science) ;
  • Kim, W.S. (Center for CMR Materials, Korea Research Institute of Standards and Science) ;
  • Hong, C.S. (Center for CMR Materials, Korea Research Institute of Standards and Science) ;
  • Hur, N.H. (Center for CMR Materials, Korea Research Institute of Standards and Science) ;
  • Choi, Y.N. (Neutron Physics Department, HANARO center, Korea Atomic Energy Research Institute)
  • Published : 2003.05.20
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Abstract

The structural, magnetic, and transport properties of a mono-layered manganite $La_{0.7}Sr_{1.3}MnO_{4+{\delta}}$ were investigated using variable temperature neutron powder diffraction as well as magnetization and transport measurements. The compound adopts the tetragonal I4/mmm symmetry and exhibits no magnetic reflection in the temperature region of 10 K ≤ T ≤ 300 K. A weak ferromagnetic (FM) transition occurs about 130 K, which almost coincides with the onset of a metal-insulator (M-I) transition. Extra oxygen that occupies the interstitial site between the [(La,Sr)O] layers makes the spacing between the [MnO₂] layers shorten, which enhances the inter-layer coupling and eventually leads to the M-I transition. We also found negative magneto resistance (MR) below the M-I transition temperature, which can be understood on the basis of the percolative transport via FM metallic domains in the antiferromagnetic (AFM) insulating matrix.

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References

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