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数学
TWIN DOMAIN AND DOMAIN BOUNDARY IN RBa_2Cu_3O_(7-x) SUPERCONDUCTING MATERIAL
<正> Ⅰ. INTRODUCTIONA number of investigators have reported recently that crystal grains of RBa_2Cu_3O_(7-x) invariably contain at least one set of parallel(110)twin domain, where R represents La, Y, Eu and Tl. The grain with twin domain is confirmed to be a superconducting phase of orthorhombic structure. Twins of this kind are usually called transformation twins(in contrast to, for instance, growth twins or deformation twins and twin boundary). However, de-
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数学
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Chinese Science Bulletin
1990年13期

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