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Epitaxial Growth and Transport Properties of Magnetic Weyl Semimetal Co3Sn2S2 Thin Films
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-01-15 , DOI: 10.1021/acsaelm.9b00650 Shuhui Li 1, 2 , Gangxu Gu 1, 2 , Enke Liu 1, 3 , Peng Cheng 1, 2 , Baojie Feng 1, 2 , Yongqing Li 1, 2, 4 , Lan Chen 1, 2 , Kehui Wu 1, 2, 4
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-01-15 , DOI: 10.1021/acsaelm.9b00650 Shuhui Li 1, 2 , Gangxu Gu 1, 2 , Enke Liu 1, 3 , Peng Cheng 1, 2 , Baojie Feng 1, 2 , Yongqing Li 1, 2, 4 , Lan Chen 1, 2 , Kehui Wu 1, 2, 4
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Shandite type Co3Sn2S2 has been reported as a magnetic Weyl semimetal recently and predicted to realize the quantum anomalous Hall effect in a two-dimensional limit. So far, electron transport studies were mostly conducted on bulk crystals, while ultrathin Co3Sn2S2 films are desirable for further gate-tunable studies and device applications. Here, we report the molecular beam epitaxy growth of Co3Sn2S2 thin films with thickness as thin as 18 nm on SrTiO3(111) substrates. Compelling characterizations indicate the high quality of the thin film. In addition to much larger coercive fields, the Co3Sn2S2 thin film also allow for the observation of pronounced hysteresis in the magnetoresistance, which was barely noticeable in the bulk samples. Furthermore, we show that the anomalous Hall conductivity can be varied by more than 2 orders of magnitude by adjusting the growth conditions of the Co3Sn2S2 thin films. Our studies suggest a feasible approach to fabricate highly tunable Co3Sn2S2 thin films for further exploration of their unique electronic properties.
中文翻译：
磁性Weyl半金属Co 3 Sn 2 S 2薄膜的外延生长和传输性质
刚玉型的Co 3 Sn 2 S 2最近被报道为磁性的Weyl半金属，并被预测在二维极限内实现量子异常霍尔效应。到目前为止，电子传输研究主要是在块状晶体上进行的，而超薄Co 3 Sn 2 S 2薄膜对于进一步的栅极可调性研究和器件应用是理想的。在这里，我们报道了在SrTiO 3上厚度为18 nm的Co 3 Sn 2 S 2薄膜的分子束外延生长（111）个基板。引人注目的特征表明该薄膜的高质量。除了更大的矫顽场外，Co 3 Sn 2 S 2薄膜还可以观察到明显的磁阻滞后现象，这在大块样品中几乎没有注意到。此外，我们表明，通过调节Co 3 Sn 2 S 2薄膜的生长条件，可以将异常霍尔电导率变化超过2个数量级。我们的研究提出了一种可行的方法来制造高度可调谐的Co 3 Sn 2 S 2薄膜，以进一步探索其独特的电子性能。
更新日期：2020-01-15
中文翻译：
磁性Weyl半金属Co 3 Sn 2 S 2薄膜的外延生长和传输性质
刚玉型的Co 3 Sn 2 S 2最近被报道为磁性的Weyl半金属，并被预测在二维极限内实现量子异常霍尔效应。到目前为止，电子传输研究主要是在块状晶体上进行的，而超薄Co 3 Sn 2 S 2薄膜对于进一步的栅极可调性研究和器件应用是理想的。在这里，我们报道了在SrTiO 3上厚度为18 nm的Co 3 Sn 2 S 2薄膜的分子束外延生长（111）个基板。引人注目的特征表明该薄膜的高质量。除了更大的矫顽场外，Co 3 Sn 2 S 2薄膜还可以观察到明显的磁阻滞后现象，这在大块样品中几乎没有注意到。此外，我们表明，通过调节Co 3 Sn 2 S 2薄膜的生长条件，可以将异常霍尔电导率变化超过2个数量级。我们的研究提出了一种可行的方法来制造高度可调谐的Co 3 Sn 2 S 2薄膜，以进一步探索其独特的电子性能。
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