Point-contact spectroscopy on antiferromagnetic Kondo semiconductors CeT2Al10(T= Ru and Os)
Point-contact spectroscopy on antiferromagnetic Kondo semiconductors CeT2Al10(T= Ru and Os)
复制标题
反铁磁近藤半导体 CeT2Al10(T= Ru 和 Os) 的点接触光谱
DOI：
10.1088/1674-1056/ab8dab
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发表时间：
2020
影响因子：
1.7
通讯作者：
Lu Xin
中科院分区：
文献类型：
--
作者：
Li Jie;Che Li-Qiang;Le Tian;Zhang Jia-Hao;Sun Pei-Jie;Takabatake Toshiro;Lu Xin
我们对尼尔温度 T N∼ 27.5 和 28.5 K 的一族反铁磁近藤半导体 CeT 2 Al 10 (T= Ru 和 Os) 进行了点接触光谱 (PCS) 测量。它们的 PCS 电导曲线在低于 T N 的温度下都表现出特征性的相干双峰结构，表明费米表面周围存在 AFM 间隙。温度相关的 AFM 间隙 Δ 1 遵循类似 Bardeen-Cooper-Schrieffer (BCS) 的平均场行为，PCS 沿不同晶轴具有适度的间隙各向异性。在远低于 T N 的温度下，两种化合物都观察到了另一个不对称的类间隙特征，这与长程有序 AFM 态内新的杂交间隙 Δ h 的打开一致。我们的结果表明异常 AFM 排序具有共同的巡回性质，限制了解释 CeRu 2 Al 10 和 CeOs 2 Al 10 中 AFM 起源的理论模型。
We have carried out point-contact spectroscopy (PCS) measurements on one family of antiferromagnetic Kondo semiconductor CeT 2 Al 10 (T= Ru and Os) with a Nèel temperature T N∼ 27.5 and 28.5 K, respectively. Their PCS conductance curves both exhibit a characteristic coherent double-peak-structure at temperatures below T N, signaling an AFM gap around the Fermi surface. The temperature dependent AFM gap Δ 1 follows a Bardeen–Cooper–Schrieffer (BCS)-like mean-field behavior with a moderate gap anisotropy for PCS along different crystal axes. Another asymmetric gap-like feature is observed for both compounds at temperatures far below T N, which is consistent with opening of a new hybridization gap Δ h inside the long-range ordered AFM state. Our results suggest a common itinerant nature of the anomalous AFM ordering, constraining theoretical models to explain the AFM origin in CeRu 2 Al 10 and CeOs 2 Al 10.