Abstract
Using a method of in-situ pressing X-ray diffraction, a uniaxial pressure-induced unusual change of lattice parameters and a remarkable crystal structural distortion have been observed in the perovskite-type La-Sr-Mn-O system. The pressure coefficient of lattice parameter in [200] orientation, i.e. dlndMn-O-Mn/dP, can reach about 3.76 × 10−4/Map for La0.85Sr0.15MnO3. Under a uniaxial pressure of only 20 ∼ 30 20&30 MPa, a giant piezoresistance 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 colossal magnetoresistance perovskites is very flexible and their transport properties are structurally sensitive.
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