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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Disordering Effects in the Atomic Structure of Fine-Crystalline HTSC YBa_2Cu_3O_y
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Disordering Effects in the Atomic Structure of Fine-Crystalline HTSC YBa_2Cu_3O_y

机译：细晶HTSC YBa_2Cu_3O_y原子结构中的无序效应

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摘要

The atomic structure of YBa_2Cu_3O_y fine-crystalline HTSC samples with various average crystal-lite sizes ranging from 0.4 to 2 μm and an oxygen concentration y close to the optimal value for super-conductivity (y ≈ 6.93) is investigated by the neutron diffraction technique. We have found some effects asso-ciated with the redistribution of cations and oxygen atoms and with variations in the positions of atomic layers in the unit cell, which are not observed in macrocrystalline samples. In all probability, these effects appear due to nonequilibrium conditions of synthesis required for obtaining this compound in the fine-crystalline state. The results have made it possible to explain the peculiar physical properties of fine-crystalline YB_a2C_u3O_y samples (in particular, the coexistence of high superconducting transition temperatures Tc and noticeably lower values of magnetization in strong magnetic fields for T < T_c). It is shown that a nanoscale structural inhomogeneity exists in fine-crystalline YBa_2Cu_3O_y samples with the optimal oxygen content and changes the fundamental superconducting parameters, viz., the magnetic field penetration depth and the coherence length.
机译：用中子研究了YBa_2Cu_3O_y微晶HTSC样品的原子结构，其平均晶格尺寸在0.4至2μm之间，氧浓度y接近超导性的最佳值（y≈6.93）。衍射技术。我们发现了一些与阳离子和氧原子的重新分布以及晶胞中原子层位置的变化有关的效应，而在大晶体样品中则没有观察到这种效应。这些效果很可能是由于获得这种微晶态化合物所需的非平衡合成条件而出现的。结果使得有可能解释细晶YB_a2C_u3O_y样品的特殊物理特性（尤其是高超导转变温度Tc和强磁场中T

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