论文标题
观察面内磁场诱导的FESE的相变
Observation of the in-plane magnetic field-induced phase transitions in FeSe
论文作者
论文摘要
我们使用扭矩磁力测定法，特定热量，磁化测量值研究了面内磁场下FESE的热力学特性。在临界场HC2上方，我们观察到H1〜15 t和H2〜22 t接近H // AB的磁场诱导的异常，并且在特征温度T* 〜2 K下方。过渡磁场H1和H2表现出对温度和场方向的依赖性的依赖性可忽略不计。这与HC2的强温度和角度依赖性形成对比，这表明这些异常归因于场引起的相变，源自超导间隙minima附近的固有的旋转密度波不稳定性或可能的flude-feLude-ferrell-ferrell-larkar-larkinnikov state在高度的旋转旋转式的surfercied filmi surfmi surfmi surferfmi surferfmi。我们的观察结果表明，FESE是一种非典型的多型超导体，具有极小的费米能量，它代表了一个独特的模型系统，用于稳定超过Pauli限制的异常超导订单。
We investigate the thermodynamic properties of FeSe under the in-plane magnetic fields using torque magnetometry, specific heat, magnetocaloric measurements. Below the upper critical field Hc2, we observed the field-induced anomalies at H1 ~ 15 T and H2 ~ 22 T near H//ab and below a characteristic temperature T* ~ 2 K. The transition magnetic fields H1 and H2 exhibit negligible dependence on both temperature and field orientation. This contrasts with the strong temperature and angle dependence of Hc2, suggesting that these anomalies are attributed to the field-induced phase transitions, originating from the inherent spin-density-wave instability of quasiparticles near the superconducting gap minima or possible Flude-Ferrell-Larkin-Ovchinnikov state in the highly spin-polarized Fermi surfaces. Our observations imply that FeSe, an atypical multiband superconductor with extremely small Fermi energies, represents a unique model system for stabilizing unusual superconducting orders beyond the Pauli limit.
