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arXiv 2302.07015cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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通过单轴应力设计条纹有序铜氧化物相图

Designing the stripe-ordered cuprate phase diagram through uniaxial-stress

Z. Guguchia, D. Das, G. Simutis, T. Adachi, J. Küspert, N. Kitajima, M. Elender, V. Grinenko, O. Ivashko, M. v. Zimmermann, M. Müller, C. Mielke, F. Hotz, C. Mu… 展开作者

Z. Guguchia, D. Das, G. Simutis, T. Adachi, J. Küspert, N. Kitajima, M. Elender, V. Grinenko, O. Ivashko, M. v. Zimmermann, M. Müller, C. Mielke, F. Hotz, C. Mudry, C. Baines, M. Bartkowiak, T. Shiroka, Y. Koike, A. Amato, C. W. Hicks, G. D. Gu, J. M. Tranquada, H. -H. Klauss, J. J. Chang, M. Janoschek, H. Luetkens

AI总结:

本研究通过单轴应力调控La_2-xBa_xCuO_4条纹相,发现极低应力可大幅提升三维超导临界温度、消除1/8反常,揭示了自旋条纹有序、晶体有序与超导性的协同作用及共同物理机制的可能性。

摘要:

高效调控铜氧化物高温超导体中电荷与自旋的能力对基础研究至关重要,也是技术发展的基础。本文中,我们针对组分为x = 0.115和0.135的铜氧化物La_2-xBa_xCuO_4的条纹相,开展了磁性、超导性与晶体结构的可调性研究:采用温度低至400 mK的温度依赖型μ子自旋旋转、交流磁化率测量,以及在CuO_2平面内施加压应力单轴应力下的X射线散射实验。研究发现,施加仅0.1 GPa的极低单轴应力后,两个样品的三维(3D)超导临界温度T_c提升了6倍,且三维相位相干性完全恢复。这一结果表明单轴应力可消除铜氧化物中著名的1/8反常现象。另一方面,自旋条纹有序温度以及400 mK下的磁组分在应力作用下仅出现小幅下降。此外,在高应力区间,三维超导的起始温度与自旋条纹有序的起始温度十分接近。而在升高温度时,磁体积分数大幅下降,且低温四方结构被完全抑制——这是形成具有最优T_c的三维超导相的必要条件。我们的结果证明,长程静态自旋条纹有序、底层晶体有序与三维完全相干超导性之间存在显著的协同作用。总体而言,这些结果表明条纹有序与超导有序可能具有共同的物理机制。

英文摘要:

The ability to efficiently control charge and spin in the cuprate high-temperature superconductors is crucial for fundamental research and underpins technological development. Here, we explore the tunability of magnetism, superconductivity and crystal structure in the stripe phase of the cuprate La_2-xBa_xCuO_4, with x = 0.115 and 0.135, by employing temperature-dependent (down to 400 mK) muon-spin rotation and AC susceptibility, as well as X-ray scattering experiments under compressive uniaxial stress in the CuO_2 plane. A sixfold increase of the 3-dimensional (3D) superconducting critical temperature T_c and a full recovery of the 3D phase coherence is observed in both samples with the application of extremely low uniaxial stress of 0.1 GPa. This finding demonstrates the removal of the well-known 1/8-anomaly of cuprates by uniaxial stress. On the other hand, the spin-stripe order temperature as well as the magnetic fraction at 400 mK show only a modest decrease under stress. Moreover, the onset temperatures of 3D superconductivity and spin-stripe order are very similar in the large stress regime. However, a substantial decrease of the magnetic volume fraction and a full suppression of the low-temperature tetragonal structure is found at elevated temperatures, which is a necessary condition for the development of the 3D superconducting phase with optimal T_c. Our results evidence a remarkable cooperation between the long-range static spin-stripe order and the underlying crystalline order with the three-dimensional fully coherent superconductivity. Overall, these results suggest that the stripe- and the SC order may have a common physical mechanism.

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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