Characteristic features of low-temperature structural phase transitions in La x-2Sr x CuO4 |
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| Authors: | Y. Inoue Y. Horibe Y. Koyama |
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| Affiliation: | (1) Structural Analysis Section, Research Department, Nissan ARC Ltd., 1 Natsushima-cho, Yokosuka, 237 Kanagawa, Japan;(2) Department of Materials Science and Engineering, Waseda University, Shinjuku-ku, 169 Tokyo, Japan;(3) Kagami Memorial Laboratory for Materials Science and Technology, and Advanced Research Center for Science and Engineering, Waseda University, Shinjuku-ku, 169 Tokyo, Japan |
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| Abstract: | Features of low-temperature structural phase transitions in La{2-x}SrxCuO4 with x = 0.115 and 0.15 have been examined by transmission electron microscopy. There are 100-type forbidden spots due to thePccn/LTT phase as well as fundamental spots due to the LTO phase in the electron-diffraction patterns of Lax-2SrxCuO4 with x = 0.115 and 0.15 at 12 K. As for 100-type forbidden dark field images at 12 K, a bright-line contrast due to thePccn/LTT phase exists only along the twin boundary in the LTO phase for x = 0.15. In the case of x = 0.115, a bright-spot contrast due to thePccn/LTT phase also appears partially inside the LTO domains, in addition to the bright-line contrast along the twin boundary. That is, the low-temperature transition in x = 0.115 is characterized by the appearance of thePccn/LTT phase with the spotty shape inside the LTO domain. |
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| Keywords: | La{2-x}SrxCuO4 structural phase transitions transmission electron microscopy |
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