arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1907.11706cond-mat.supr-concond-mat.dis-nncond-mat.str-el
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涡旋phase diagram和具有电荷和自旋序的铜氧化物的正常态

Vortex phase diagram and the normal state of cuprates with charge and spin orders

Zhenzhong Shi, P. G. Baity, T. Sasagawa, Dragana Popović

摘要:

欠掺杂铜氧化物在磁场中的相图($H$)是理解这些高温超导体反常正常态的关键因素。然而,上临界场($H_{c2}$)或超导相与涡旋的程度,一种拓扑激发,以及在高$H$中存在的电荷顺序的作用,仍然存在争议。我们解决这些问题,通过研究条纹有序的La-214,即铜酸盐中的电荷顺序是最明显的和零场转变温度$T_{c}^{0}$是最低的,后者打开了一个更大的能量尺度窗口,探索涡旋相相比,以前的研究。通过结合对涡旋物质敏感的线性和非线性输运技术,我们确定了$T$ - $H$相图,直接检测了$H_{c2}$,并揭示了高场基态的新特性。我们的研究结果表明,虽然低掺杂的铜酸盐的涡旋相图是不是很敏感的电荷顺序的细节,量子涨落和无序发挥了关键作用,$T\rightarrow 0$。另一方面,条纹的存在似乎改变了反常正常态的性质,使得高场基态是金属,而不是绝缘体。

英文摘要:

The phase diagram of underdoped cuprates in a magnetic field ($H$) is the key ingredient in understanding the anomalous normal state of these high-temperature superconductors. However, the upper critical field ($H_{c2}$) or the extent of superconducting phase with vortices, a type of topological excitations, and the role of charge orders that are present at high $H$, remain under debate. We address these questions by studying stripe-ordered La-214, i.e. cuprates in which charge orders are most pronounced and zero-field transition temperatures $T_{c}^{0}$ are lowest; the latter opens a much larger energy scale window to explore the vortex phases compared to previous studies. By combining linear and nonlinear transport techniques sensitive to vortex matter, we determine the $T$-$H$ phase diagram, directly detect $H_{c2}$, and reveal novel properties of the high-field ground state. Our results demonstrate that, while the vortex phase diagram of underdoped cuprates is not very sensitive to the details of the charge orders, quantum fluctuations and disorder play a key role as $T\rightarrow 0$. The presence of stripes, on the other hand, seems to alter the nature of the anomalous normal state, such that the high-field ground state is a metal, as opposed to an insulator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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