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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 24, Number 5
BKCSDE 24(5)
May 20, 2003 

Metal-Insulator Transition Induced by Short Range Magnetic Ordering in Mono-layered Manganite
E. O. Chi, W. S. Kim, C. S. Hong, N. H. Hur, Y. N. Choi
Magnetism, Manganese oxide, Magnetic ordering
The structural, magnetic, and transport properties of a mono-layered manganite La0.7Sr1.3MnO4+ d wereinvestigated 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.
573 - 578
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