Large lattice compression coefficient and uniaxial piezoresistance in CMR perovskite La1−XSrXMaO3 (0.15 ≤ x ≤ 0.25) |
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| Authors: | N Zhang W P Ding Z B Guo W Zhong D Y Xing Y W Du G Li Y Zheng |
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| Institution: | 1. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, People’s Republic of China
2. Key Laboratory of Jiang Su Province for Optic & Electric Techniques, Nanjing Normal University, Nanjing, 210024, People’s Republic of China
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| 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. dlnd Mn-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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