Cu $_2$ 0 SeO $_3$中第二Skyrmion晶格相和倾斜锥形相的热力学证据
Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase in Cu$_2$0SeO$_3$
摘要：
精确测量的磁化强度和交流磁化率的铜$_2$ 0SeO $_3$的报告沿不同的晶体方向的磁场，集中在边界之间的锥形和场极化状态的磁场沿$\langle 100 \rangle$轴，补充选定的比热数据。清晰的签名出现的第二skyrmion阶段和倾斜的锥形阶段观察到，最近确定的小角中子散射的手段。低温skyrmion相显示出强烈的滞后相界，但没有耗散效应。与此相反，倾斜的锥形阶段伴随着强耗散和高次谐波的贡献，而过渡领域基本上是非滞后的。第二Skyrmion相位和倾斜圆锥相位的形成被发现是不敏感的一个消失的退磁因子。磁晶各向异性的温度依赖性的定量估计可以一致地推断出从磁化强度和上临界场，并同意与稳定的低温skyrmion相位和倾斜的锥形状态由常规的立方磁各向异性。
英文摘要：
Precision measurements of the magnetization and ac susceptibility of Cu$_2$0SeO$_3$ are reported for magnetic fields along different crystallographic directions, focussing on the border between the conical and the field-polarized state for a magnetic field along the $\langle 100 \rangle$ axis, complemented by selected specific heat data. Clear signatures of the emergence of a second skyrmion phase and a tilted conical phase are observed, as recently identified by means of small-angle neutron scattering. The low-temperature skyrmion phase displays strongly hysteretic phase boundaries, but no dissipative effects. In contrast, the tilted conical phase is accompanied by strong dissipation and higher-harmonic contributions, while the transition fields are essentially nonhysteretic. The formation of the second skyrmion phase and tilted conical phase are found to be insensitive to a vanishing demagnetization factor. A quantitative estimate of the temperature dependence of the magnetocrystalline anisotropy may be consistently inferred from the magnetization and the upper critical field and agrees well with a stabilization of the low-temperature skyrmion phase and tilted conical state by conventional cubic magnetic anisotropies.
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