Magnetism and transport in transparent high-mobility BaSnO3 films doped with La, Pr, Nd, and Gd
Magnetism and transport in transparent high-mobility BaSnO3 films doped with La, Pr, Nd, and Gd
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DOI：
10.1103/physrevmaterials.3.124402
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发表时间：
2019-12-09
影响因子：
3.4
通讯作者：
Suzuki, Yuri
中科院分区：
文献类型：
--
作者：
Alaan, Urusa S.;Wong, Franklin J.;Suzuki, Yuri
我们探讨了磁性稀土掺杂剂的替代纳入Ba网站的BaSnO3的电子输运，磁性和光学性质的影响。我们发现，对于Ba0.92R0.08SnO3薄膜（其中R = La，Pr，Nd，Gd），有一个线性增加的载流子浓度在所有的掺杂方案的迁移率。La掺杂的薄膜具有最高的迁移率，其次是Pr和Nd掺杂的薄膜。Gd掺杂的样品具有与Ba位点最大的离子尺寸失配，并且相应地具有最低的载流子浓度和电子迁移率。然而，结晶度似乎并不是一个强有力的预测传输现象，我们的研究结果表明，点缺陷超过晶界的关键成分，在调整脉冲激光沉积生长的BaSnO3薄膜的传导。明显的，非滞后的X射线磁二色性信号观察Pr，Nd和Gd掺杂的样品，表明顺磁性。最后，我们探测每个BaSnO3掺杂方案的光学常数，并注意到所有样品的透射率几乎没有变化。这些结果揭示了稀土离子掺杂BaSnO3的导电机制。
We have explored the effect of magnetic rare-earth dopants substitutionally incorporated on the Ba sites of BaSnO3 in terms of electronic transport, magnetism, and optical properties. We show that for Ba0.92R0.08SnO3 thin films (where R = La, Pr, Nd, Gd), there is a linear increase of mobility with carrier concentration across all doping schemes. La-doped films have the highest mobilities, followed by Pr- and Nd-doped films. Gd-doped samples have the largest ionic size mismatch with the Ba site and correspondingly the lowest carrier concentrations and electron mobilities. However, crystallinity does not appear to be a strong predictor of transport phenomena; our results suggest that point defects more than grain boundaries are key ingredients in tuning the conduction of BaSnO3 films grown by pulsed laser deposition. Pronounced, nonhysteretic x-ray magnetic dichroism signals are observed for Pr-, Nd-, and Gd-doped samples, indicating paramagnetism. Finally, we probe the optical constants for each of the BaSnO3 doping schemes and note that there is little change in the transmittance across all samples. Together these results shed light on conduction mechanisms in BaSnO3 doped with rare-earth cations.