自由基四聚体形成的量子磁体中的非常规场诱导相
Unconventional field induced phases in a quantum magnet formed by free radical tetramers
摘要：
我们报告的磁性和热力学性质的NIT-2 Py，自由基为基础的有机磁体的实验和理论研究。从磁化强度和比热测量，我们建立了温度-磁场相图，其中包括两个玻色-爱因斯坦凝聚体（BEC）和一个罕见的半磁化平台。基于密度泛函理论的计算表明，该体系在磁性上可以映射为弱耦合四聚体的准二维结构。密度矩阵重整化群计算显示了BEC的特殊性质，即形成低场凝聚的自旋不同于参与高场凝聚的自旋.
英文摘要：
We report experimental and theoretical studies on the magnetic and thermodynamic properties of NIT-2Py, a free radical-based organic magnet. From magnetization and specific heat measurements we establish the temperature versus magnetic field phase diagram which includes two Bose-Einstein condensates (BEC) and an infrequent half magnetization plateau. Calculations based on density functional theory demonstrates that magnetically this system can be mapped to a quasi-two-dimensional structure of weakly coupled tetramers. Density matrix renormalization group calculations show the unusual characteristics of the BECs where the spins forming the low-field condensate are different than those participating in the high-field one.
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