Crystallographic features of the transitional state in La1-xSrxTiO3 around x=0.05 have been examined by transmission electron microscopy. In the transitional state, the insulating O' regions with the size of about 3nm are distributed in the metallic O' matrix. Note that the O' and O* phases have the Pbnm structures with the Jahn-Teller distortion and without it, respectively. Because the hole concentration of the O* phase is higher than that of the O' phase, the transitional state is therefore characterized by the static electronic phase separation. In addition, it was also found that the crystal structure of the O' phase should involve not only the (3z2-r2)-type Jahn-Teller displacement with q=0 but also the (x2-y2)-type one with q=<1/2 1/2 0>c in the cubic Brillouin zone.
|ジャーナル||International Journal of Modern Physics B|
|出版ステータス||Published - 2000 12 20|
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