论文标题
旋转载波耦合诱导的铁磁性和EUCD巨大电阻率$ _2 $ P $ _2 $
Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd$_2$P$_2$
论文作者
论文摘要
EUCD $ _2 $ P $ _2 $以其非常规的运输而闻名：冷却金属电阻率变化后，并开始增加100倍，然后返回其金属价值。令人惊讶的是，这个巨大的峰值发生在18k，远高于11.5k的Néel温度（$ T_N $）。使用一套敏感的磁性探针，包括谐振X射线散射和磁光偏光仪，我们发现在电阻率峰的温度范围内，铁磁阶在$ t_n $上方的运营率高于$ t_n $。在这种制度中观察到倒置滞后的观察表明，通过局部旋转和巡回携带者的耦合来促进铁磁主义。由光导率测量确认了所得的载体定位。
EuCd$_2$P$_2$ is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning to its metallic value. Surprisingly, this giant peak occurs at 18K, well above the Néel temperature ($T_N$) of 11.5K. Using a suite of sensitive probes of magnetism, including resonant x-ray scattering and magneto-optical polarimetry, we have discovered that ferromagnetic order onsets above $T_N$ in the temperature range of the resistivity peak. The observation of inverted hysteresis in this regime shows that ferromagnetism is promoted by coupling of localized spins and itinerant carriers. The resulting carrier localization is confirmed by optical conductivity measurements.
