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arXiv 2602.18229cond-mat.str-el
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压强和磁化下的Shastry-Sutherland反铁磁Mott绝缘体SrCu2(BO3)2的T线性比热

T-linear specific heat in pressurized and magnetized Shastry-Sutherland Mott insulator SrCu2(BO3)2

University of Chinese Academy of Sciences(中国科学院大学);Department of Physics and HK Institute of Quantum Science & Technology, The University of Hong Kong(香港大学);State Key Laboratory of Optical Quantum Materials, The University of Hong Kong(香港大学);Center for High Pressure Science & Technology Advanced Research(高压科学与技术前沿研究中心)
Jing Guo, Pengyu Wang, Cheng Huang, Chengkang Zhou, Menghan Song, Xintian Chen, Ting-Tung Wang, Wenshan Hong, Shu Cai, Jinyu Zhao, Jinyu Han, Yazhou Zhou, Qi Wu… 展开作者

Jing Guo, Pengyu Wang, Cheng Huang, Chengkang Zhou, Menghan Song, Xintian Chen, Ting-Tung Wang, Wenshan Hong, Shu Cai, Jinyu Zhao, Jinyu Han, Yazhou Zhou, Qi Wu, Shiliang Li, Zi Yang Meng, Liling Sun

AI总结:

研究发现SrCu2(BO3)2在强磁场下表现出T线性比热行为,揭示了其相图的丰富性并需新理论框架解释。

摘要:

压强下的Shastry-Sutherland Mott绝缘体SrCu2(BO3)2被发现宿主一个plaquette- singlet相和一个反铁磁相,它们分别自发打破不同的对称性。最近的实验显示它们的转变属于一级相变,这似乎与在著名受阻量子磁体中追求 exotic 和 deconfined 自由度相悖。我们发现了一个新的研究方向。通过向材料施加磁场,我们发现SrCu2(BO3)2在接近零场一级相变压力的较大磁化场范围内表现出普遍的金属T线性比热行为。这种意外的无能隙响应来自电子间隙的Mott绝缘体可能归因于磁化Dirac自旋子在磁场和压力共同作用下的释放,这在我们对Shastry-Sutherland模型在磁场下的量子多体热张量网络计算中得到一致观察。这种稳健且普遍的T线性比热相揭示了由压力和磁场轴扩展的材料相图的丰富性,并呼吁新的理论框架来完整解释。

英文摘要:

The pressurized Shastry-Sutherland Mott insulator SrCu2(BO3)2 has been found to host a plaquette-singlet phase and an antiferromagnetic phase that break different symmetries spontaneously.The recent experiment showed that their transition is of a first order nature, which seems against the pursuit of exotic and deconfined degrees of freedom in this famous frustrated quantum magnet. We found a new direction in this study. By applying a magnetic field to the material, we discover that SrCu2(BO3)2 exhibits a universal and metallic T-linear specific heat behavior in a large magnetitic field range close to the pressure of zero-field first order transition between plaquette-singlet and antiferromagnetic phases. Such an unexpected gapless response from an electronically gapped Mott insulator could be attributed to magnetized Dirac spinons liberated by the combined effect of magnetic field and pressure, consistently seen from our quantum many-body thermal tensor network computation of the Shastry-Sutherland model under magnetic field. Such a robust and universal T-linear specific heat phase points out the richness of the phase diagram of the material expanded by the axes of pressure and magnetic field and is calling for new theoretical frameworks to its full explanation.

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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