Effects of High Pressures on Bi2+xSr2Ca1-xCu2Oy Superconducting Single Crystals with Different Tc
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摘要: 在研究BiSrCaCuO超导单晶的过程中，我们发现材料的实际化学组分与理想的2212相配比组分有着一定的差别，正是这种成分偏析造成了样品的Tc与结构的不同。本文研究了在压力下不同Tc的样品随压力改变Tc的变化关系，发现偏析越大、Tc越低的样品的dTc/dp也越大，而越接近理想组分，则dTc/dp越趋于最小值，还可以从此推断出BiSrCaCuO理想单晶材料的Tc最佳值。压力对超导电性的这种影响可能与耦合链长的变化有关。Abstract: Under high pressures the Tc of Bi-Sr-Ca-Cu-O single crystals with different content segregation will change differently. We found that, samples with larger segregation and lower Tc exhibit higher dTc/dp. When the sample approaches to the ideal composition, it exhibit lowest dTc/dp. The high pressure effects on Tc may be closely related to the variation of bonding length.
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