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- W3036158049 abstract "In the concentration range of the local T c minimum in La 2-x Ba x CuO 4 (0.10≤×≤0.15), below 60K, there is a low temperature tetragonal (LTT) structure (space group P4 2 /ncm). With an increase in temperature, the structure becomes orthorhombic (LTO, space group Bmab), then above 140K becomes tetragonal (HTT) with the space group I4/mmm. The transition from HTT to LTO during cooling generates twins, and the twin morphology persists even below 60K. This is inconsistent with a pure LTT phase, since twinning is associated with an orthorhombic symmetry. To address the issue of the LTO/LTT phase transition, we performed in-situ experiments with a 200 keV TEM equipped with a liquid H 2 specimen holder. Fig.1(a) and (b) show selected area diffraction patterns taken at 15K in the (001) * and (101) * zone, respectively. During in- situ cooling and the LTO/LTT transition, the (101) * diffraction pattern remains the same because h+l=2n reflections are allowed in both LTO and LTT." @default.
- W3036158049 created "2020-06-25" @default.
- W3036158049 creator A5034993993 @default.
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- W3036158049 date "1995-08-13" @default.
- W3036158049 modified "2023-10-16" @default.
- W3036158049 title "In situ study of tetragonal-orthorhombic structural transformation in La2-xBaxCuO4" @default.
- W3036158049 cites W2036350055 @default.
- W3036158049 cites W4595624 @default.
- W3036158049 doi "https://doi.org/10.1017/s0424820100137525" @default.
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