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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 

 
Title
Metal-Insulator Transition Induced by Short Range Magnetic Ordering in Mono-layered Manganite
Author
E. O. Chi, W. S. Kim, C. S. Hong, N. H. Hur, Y. N. Choi
Keywords
Magnetism, Manganese oxide, Magnetic ordering
Abstract
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.
Page
573 - 578
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