Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements (Editors' suggestion)
Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements (Editors' suggestion)
复制标题
通过角度分辨磁化测量研究接近三临界点的伊辛铁磁体 URhGe 相图中的翼结构（编辑建议）
DOI：
10.1103/physrevb.96.094411
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发表时间：
2017
影响因子：
3.7
通讯作者：
and E. Yamamoto.
中科院分区：
文献类型：
--
作者：
S. Nakamura;T. Sakakibara;Y. Shimzu;S. Kittaka;Y. Kono;Y. Haga;J. Pospisil;and E. Yamamoto.
高精度角分辨直流磁化强度和磁矩的研究进行了单晶样品的URhGe，正交伊辛铁磁体的轴是磁化易轴，为了研究相图周围的铁磁（FM）重取向转变在轴附近的磁场。我们已经清楚地检测到在低温下的磁化强度和磁转矩的一阶转变，并确定了三维相图的翼结构的详细轮廓，其中和分别表示沿着和轴的场分量。量子翼的临界点位于T和T。当温度升高到K时，机翼平面边界处的两条二阶转捩线迅速趋于相互接近。然而，仅在零共轭场（）处，在K处的磁化强度的场导数中仍然可以看到一级跃迁的特征，这表明三临界点存在于高于4 K的相当高的温度区域。机翼平面结构的这一特征与三个二阶转捩线在三临界点切向合并的理论预期是一致的。
High-precision angle-resolved dc magnetization and magnetic torque studies were performed on a single-crystalline sample of URhGe, an orthorhombic Ising ferromagnet with theaxis being the magnetization easy axis, in order to investigate the phase diagram around the ferromagnetic (FM) reorientation transition in a magnetic field near theaxis. We have clearly detected a first-order transition in both the magnetization and the magnetic torque at low temperatures, and determined detailed profiles of the wing structure of the three-dimensionalphase diagram, whereanddenote the field components along theand theaxes, respectively. The quantum wing critical points are located atT andT. Two second-order transition lines at the boundaries of the wing planes rapidly tend to approach each other with increasing temperature up toK. Just at the zero conjugate field (), however, a signature of the first-order transition can still be seen in the field derivative of the magnetization atK, indicating that the tricritical point exists in a rather high temperature region above 4 K. This feature of the wing plane structure is consistent with the theoretical expectation that three second-order transition lines merge tangentially at the tricritical point.