通过单轴应力设计条纹排序的铜相位图
Z Guguchia1, D Das1, G Simutis2
1Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, Switzerland.
概括
将单轴应力应用于酸超导体La[公式:参见文本]Ba[公式:参见文本]CuO[公式:参见文本]显著增强了超导性,同时仅略微影响了旋带顺序,这表明这两种现象都有共同的物理起源.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 超导性研究 超导性研究
背景情况:
- 控制高温超导体中的电荷和旋转对于基础科学和技术至关重要.
- 酸盐中的条纹相,如La[公式:见文本]Ba[公式:见文本]CuO[公式:见文本],表现出磁性,超导性和晶体结构之间的复杂相互作用.
- 酸盐中的1/8异常在理解它们的超导机制方面提出了重大挑战.
研究的目的:
- 为了研究磁力,超导和晶体结构的可调性,在La[公式:见文本]Ba[公式:见文本]CuO[公式:见文本]的条纹阶段,在单轴应力下.
- 探索压力单轴应力对3D超导的临界温度 ([公式:见文本]) 和相连度的影响.
- 检查自旋条形顺序和超导性之间的关系,并探讨潜在的共同物理机制潜在的两者.
主要方法:
- 利用了取决于温度的子旋转和交流易感性实验 (低至400mK).
- 在CuO[公式:参见文本]平面应用压力单轴应力下的X射线散射实验.
- 研究了两个La[公式:见文本]Ba[公式:见文本]CuO[公式:见文本]的样本,其中[公式:见文本]=0.115和0.135.
主要成果:
- 在最小的单轴应力 (~0.1 GPa) 的情况下,观察到3D超导临界温度 ([公式:参见文本]) 增加了六倍,并完全恢复了3D相连贯性.
- 施加压力有效地消除了 cuprates 中的 1/8 异常.
- 线条顺序温度和磁分数在应力下仅略有下降,在高应力下,3D超导和线条顺序的起始温度变得相似. 压力诱导的不均抑制自旋条形的顺序和完全抑制低温四角形结构.
结论:
- 单轴应力显示出一种强大的方法来增强超导性和克服 cuprates 中的异常.
- 结果揭示了长距离自旋条形顺序,晶体顺序和3D连贯超导之间的强烈合作.
- 这些发现强烈表明,条纹顺序和超导顺序可能具有共同的潜在物理机制.
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