Thermodynamics of a frustrated quantum magnet on a square lattice
Thermodynamics of a frustrated quantum magnet on a square lattice
复制标题
方形晶格上受挫量子磁体的热力学
作者：
K. Povarov;V. K. Bhartiya;Z. Yan;A. Zheludev
本文报道了方阵$J_{1}-J_{2}$量子反铁磁体BaCdVO(PO$_4$)$_2$的单晶样品的磁性和量热测量。对磁化尺度的调查揭示了“维数减少”，表明几何挫折的强烈程度。在特征温度$T^{ast}simeq150$~mK以下，我们观察到一个接近完全磁饱和的额外的强波动量子相的出现。根据外加磁场的方向，它通过一阶和二阶相变与磁有序态分离。我们认为这个相可能确实与理论预测的自旋向列态有关。
We report the magnetic and calorimetric measurements in single crystal samples of the square lattice $J_{1}-J_{2}$ quantum antiferromagnet BaCdVO(PO$_4$)$_2$. An investigation of the scaling of magnetization reveals a "dimensionality reduction" indicative of a strong degree of geometric frustration. Below a characteristic temperature of $T^{ast}simeq150$~mK we observe the emergence of an additional strongly fluctuating quantum phase close to full magnetic saturation. It is separated from the magnetically ordered state by first- and second-order phase transitions, depending on the orientation of the applied magnetic field. We suggest that this phase may indeed be related to the theoretically predicted spin-nematic state.