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首页> 外文会议>NATO Advanced Study Research Workshop on Symmetry and Heterogeneity in High Temperature Superconductors; 20031004-10; Erice(IT) >PHASE SEPARATION IN CUPRATES INDUCED BY DOPING, HYDROSTATIC PRESSURE OR ATOMIC SUBSTITUTION
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PHASE SEPARATION IN CUPRATES INDUCED BY DOPING, HYDROSTATIC PRESSURE OR ATOMIC SUBSTITUTION

机译：掺杂，静水压力或原子取代引起的杯子中的相分离

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摘要

Results of systematic Raman studies of phase separation induced on cuprates by doping, hydrostatic pressure, and atomic substitutions are presented. In YBa_2Cu_3O_x, oxygen doping induces a separation into microphases from the ordering of the chains, at relative amounts that vary with concentration. In the overdoped region, a similar coexistence of phases appears, which is due to the modification of the CuO_2 buckling. The excess doping of YBa_2Cu_3O_(7-δ) by Ca creates domains of pure Y123 and others where the Ca atoms are surrounded by yttrium as first neighbours. Hydrostatic pressure induces non-linear effects in almost all A_g-symmetry phonons of YBa_2Cu_3O_x, YBa_2Cu_4O_8, and the Bi_2Sr_2CaCu_2O_8 superconductors. A coexistence of phases seems to appear at a critical pressure where changes in the superconducting transition temperature have been observed.
机译：给出了通过掺杂，静水压力和原子取代对铜酸盐诱导的相分离的系统拉曼研究结果。在YBa_2Cu_3O_x中，氧掺杂会引起链的排列分离成微相，其相对量随浓度而变化。在过量掺杂的区域中，出现了相似的相共存，这是由于CuO_2屈曲的改变所致。 Ca对YBa_2Cu_3O_（7-δ）的过量掺杂会形成纯Y123和其他域，其中Ca原子被钇作为第一邻居包围。静水压力在YBa_2Cu_3O_x，YBa_2Cu_4O_8和Bi_2Sr_2CaCu_2O_8超导体的几乎所有A_g对称声子中引起非线性效应。相的共存似乎在临界压力下出现，在该临界压力下已观察到超导转变温度的变化。

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