从射频穿透深度测量得到的PDMATHAAC-（BETS）$_2$ GaCl $_4$中的超导phase diagram和FFLO特征
Superconducting phase diagram and FFLO signature in $λ$-(BETS)$_2$GaCl$_4$ from rf penetration depth measurements
摘要：
我们报告的相位图$λ$ -（BETS）$_2$ GaCl $_4$从RF穿透深度测量与隧道二极管振荡器在脉冲磁场。我们检查了四个样品与1100场扫描的角度范围内的磁场平行和垂直的导电平面。在平行方向上，$H_{c2}$似乎包括在1.6 K和10 T处的三临界点，随着温度降低到500 mK，相线增加到11 T。第二相线形成了一个明确定义的高场低温区，满足几个条件的富尔德-费雷尔-拉金-奥夫钦尼科夫（FFLO）状态。我们发现$H_{c2}$与WHH在重入$α>1$、$λ_{so}=0$方案中具有非常好的拟合。我们还注意到一个尖锐的角度依赖的相图场平行取向的特点泡利顺磁限制，并进一步支持FFLO行为的可能性。与FFLO研究无关，在低于$H_{c2}$和$T_c$的磁场和温度下，我们在穿透深度数据中发现了丰富的结构，我们将其归因于表面的杂质改变了超导特性，同时保持与$H_{c2}$相同的晶轴。
英文摘要：
We report the phase diagram of $λ$-(BETS)$_2$GaCl$_4$ from rf penetration depth measurements with a tunnel diode oscillator in a pulsed magnetic field. We examined four samples with 1100 field sweeps in a range of angles with the magnetic field parallel and perpendicular to the conducting planes. In the parallel direction, $H_{c2}$ appears to include a tricritical point at 1.6 K and 10 T with a phase line that increases to 11 T as the temperature is decreased to} 500 mK. The second phase line forms a clearly defined high field low temperature region satisfying several of the conditions of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. We show remarkably good fits of $H_{c2}$ to WHH in the reentrant $α>1$, $λ_{so}=0$ regime. We also note a sharp angle dependence of the phase diagram about the field parallel orientation that characterizes Pauli paramagnetic limiting and further supports the possibility of FFLO behavior. Unrelated to the FFLO study, at fields and temperatures below $H_{c2}$ and $T_c$, we find rich structure in the penetration depth data that we attribute to impurities at the surface altering the superconducting properties while maintaining the same crystallographic axes as $H_{c2}$.
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