Low Temperature Heat-Capacity Anomalies in Two-Dimensional Solid {sup 3}He
Low Temperature Heat-Capacity Anomalies in Two-Dimensional Solid {sup 3}He
复制标题
二维固体 {sup 3}He 中的低温热容异常
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
H. Fukuyama
中科院分区：
文献类型：
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作者：
K. Ishida;M. Morishita;K. Yawata;H. Fukuyama
已测量了吸附在石墨上的第二层固体{sup 3}He的热容量，直至低于100 {mu}K的极低温度。我们观察到一个双峰结构的低密度注册固体，这强烈表明该系统是一个高度受挫的自旋1/2二维（2D）反铁磁体与无序的基态。随着密度的增加，它接近一个2D最近邻海森堡铁磁体与一个单一的圆形峰，这可以解释半定量考虑高阶交换过程高达六自旋交换。{版权} {美国物理学会}
The heat capacity of second-layer solid {sup 3}He adsorbed on graphite has been measured down to extremely low temperatures below 100 {mu}K . We observed a double-peak structure for a low-density registered solid, which strongly suggests that the system is a highly frustrated spin-1/2 two-dimensional (2D) antiferromagnet with a disordered ground state. As the density increases it approaches a 2D nearest-neighbor Heisenberg ferromagnet with a single rounded peak, which can be explained semiquantitatively by considering higher-order exchange processes up to six-spin exchange. {copyright} {ital 1997} {ital The American Physical Society}