Abstract
Using a method ofin situ pressing X-ray diffraction, a uniaxial pressure-induced unusual change of lattice parameters and a remarkable crystal structural distortion have been observed in CMR perovskite La0 83Sr0.17 MnO3. The pressure coefficient of lattice parameter in [200] orientation, i.e. d (lndMn-O-Mn)/dP can reach about 3.8 × 10-4 MPa-1. Under the uniaxial pressure of only about 20 MPa, a giant piezoresistance, magnetization enhancing and an evident increase of Tp, the onset of the metal-semiconductor-like (M-S) transition, have also been obtained. These effects suggest that the structure of CMR perovskite is very flexible and their transport properties are very structurally sensitive.
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