发表机构
School of Physics and Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China; Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter Physics（中国人民大学物理学院和量子态构建与操控教育部重点实验室; 中国科学院物理研究所和北京凝聚态物理国家实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过高压NMR实验，发现SrCu$_2$(BO$_3$)$_2$在压力下经历结构转变，并在高压低温区呈现无隙三维反铁磁相，澄清了相变争议。
AI 中文摘要
Shastry-Sutherland化合物SrCu$_2$(BO$_3$)$_2$作为探索磁阻挫驱动的量子相和量子相变的平台引起了相当大的兴趣。然而，SrCu$_2$(BO$_3$)$_2$中压力诱导的结构和磁性相变仍存在争议。为解决这一问题，我们对SrCu$_2$(BO$_3$)$_2$进行了高达14~GPa的高压$^{11}$B核磁共振（NMR）测量。NMR谱揭示了两个压力诱导的单斜相。在压力高于4~GPa且温度低于10~K时，NMR谱的快速展宽和自旋-晶格弛豫率$1/T_1$的幂律行为为单斜相中无隙三维反铁磁（AFM）相提供了清晰证据。在约20~K的中间温度范围内，场依赖的NMR谱线分裂的出现解析出一个二维短程有序AFM相；在温度高于30~K时，$1/T_1$的次线性幂律行为识别出一个扩展的关联顺磁区域。
英文摘要
The Shastry-Sutherland compound SrCu$_2$(BO$_3$)$_2$ has attracted considerable interest as a platform for exploring quantum phases and quantum phase transitions driven by magnetic frustration. The pressure-induced structural and magnetic phase transitions in SrCu$_2$(BO$_3$)$_2$, however, remain controversial. To address this issue, we performed high-pressure $^{11}$B nuclear magnetic resonance (NMR) measurements on SrCu$_2$(BO$_3$)$_2$ up to 14~GPa. The NMR spectra reveal two pressure-induced monoclinic phases. With pressure above 4~GPa and with temperature below 10~K, the rapid broadening of the NMR spectrum and the power-law behavior in the spin-lattice relaxation rate $1/T_1$ provide clear evidence for a gapless 3D antiferromagnetic (AFM) phase in the monoclinic phase. At an intermediate temperature range around 20~K, the emergence of the field-dependent NMR line splits resolves a two-dimensional, short-range ordered AFM phase; at temperature above 30~K, the sublinear power-law behavior of $1/T_1$ identifies an extended correlated paramagnetic regime.
Comments7 pages, 4 figures
Journal refPhys. Rev. B 114, L231101 (2026)
