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arXiv 2209.07652cond-mat.str-el
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揭示 Shastry-Sutherland 化合物 SrCu2(BO3)2 在饱和磁场以上的新量子相

Unveiling new quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2up to the saturation magnetic field

T. Nomura, P. Corboz, A. Miyata, S. Zherlitsyn, Y. Ishii, Y. Kohama, Y. H. Matsuda, A. Ikeda, C. Zhong, H. Kageyama, F. Mila

AI总结:

本研究首次通过实验与理论揭示了 Shastry-Sutherland 化合物 SrCu2(BO3)2 在高达 140 T 饱和磁场下的新量子相,发现 1/2 平台与饱和态间存在多个自旋超固态相,并证实声速骤降源于磁子晶体的结构不稳定性。

摘要:

在磁场下,量子磁体通常会发生具有各种序的奇异相变。在 Shastry-Sutherland 化合物 SrCu2(BO3)2 中发现的一系列分数磁化率平台,在量子材料的高场研究中发挥了核心作用,但迄今为止,该系统只能被探测到磁化率饱和值的一半。在此,我们报告了对该化合物高达 140 T 饱和磁场及更高磁场的首次实验和理论研究。利用超声和磁致伸缩技术,结合广泛的张量网络计算(iPEPS),揭示了在 1/2 平台和饱和(1/1 平台)之间存在几个自旋超固态相。非常引人注目的是,1/2 平台的声速表现出 -50% 的急剧下降,这与棋盘型磁子晶体的四方到正交不稳定性有关。这一典范量子系统被揭示的本质,是探索极端条件下涌现的奇异物质量子态的一个新里程碑。

英文摘要:

Under magnetic fields, quantum magnets often undergo exotic phase transitions with various kinds of order. The discovery of a sequence of fractional magnetization plateaus in the Shastry-Sutherland compound SrCu2(BO3)2 has played a central role in the high-field research on quantum materials, but so far this system could only be probed up to half the saturation value of the magnetization. Here, we report the first experimental and theoretical investigation of this compound up to the saturation magnetic field of 140 T and beyond. Using ultrasound and magnetostriction techniques combined with extensive tensor-network calculations (iPEPS), several spin-supersolid phases are revealed between the 1/2 plateau and saturation (1/1 plateau). Quite remarkably, the sound velocity of the 1/2 plateau exhibits a drastic decrease of -50%, related to the tetragonal-to-orthorhombic instability of the checkerboard-type magnon crystal. The unveiled nature of this paradigmatic quantum system is a new milestone for exploring exotic quantum states of matter emerging in extreme conditions.

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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