论文标题
阶参数各向异性对UPT3中涡旋晶格的影响
Effects of the order parameter anisotropy on the vortex lattice in UPt3
论文作者
论文摘要
我们已经使用了小角度的中子散射来确定沿着晶体C轴施加的磁场的拓扑超导体UPT3中的涡旋晶格相图。在整个超导状态中都观察到三角形涡流晶格，但与六角形基础位置相对于田间和温度变化。在低温下，在手性B相中，涡旋晶格会随着磁场的增加而经历非单调旋转。旋转幅度随温度的升高和消失，然后在达到A期之前就会降低。 Huxley等人，Nature 406，160-164（2000），在A阶段中，突然+/- 15度涡旋晶格旋转。可以从超导顺序参数，对称性断裂场和费米表面各向异性的竞争效应中理解复杂的相图。低温旋转相位，以avers等人报道，自然物理学16，531-535（2020）报告，以0.8吨为中心，可以直接归因于对称性断裂场。
We have used small-angle neutron scattering to determine the vortex lattice phase diagram in the topological superconductor UPt3 for the applied magnetic field along the crystalline c-axis. A triangular vortex lattice is observed throughout the superconducting state, but with an orientation relative to the hexagonal basal place that changes with field and temperature. At low temperature, in the chiral B phase, the vortex lattice undergoes a non-monotonic rotation with increasing magnetic field. The rotation amplitude decreases with increasing temperature and vanishes before reaching the A phase. Within the A phase an abrupt +/-15 degree vortex lattice rotation was previously reported by Huxley et al., Nature 406, 160-164 (2000). The complex phase diagram may be understood from competing effects of the superconducting order parameter, the symmetry breaking field, and the Fermi surface anisotropy. The low-temperature rotated phase, centered around 0.8 T, reported by Avers et al., Nature Physics 16, 531-535 (2020), can be attributed directly to the symmetry breaking field.
