三维厚 SrRuO$_3$ 薄膜中的非常规二维量子振荡

Yuta Matsuki, Shinichi Nishihaya, Markus Kriener, Ren Oshima, Fumiya Miwa, Masaki Uchida
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引用次数: 0

摘要

SrRuO$_3$ 是一种典型的过渡金属氧化物,具有丰富的物理特性,包括巡回铁磁性、高导电性和源自韦尔点的内在霍尔效应。最近,有报告称,残余电阻率比超过 50 的高质量 SrRuO$_3$ 薄膜在低温下表现出量子振荡,尽管它具有强电子相关性。虽然人们根据韦尔半金属带结构讨论了振荡的起源与韦尔轨道的关系,但迄今为止所报道的实验结果既不相互一致,也不符合理论上的预期行为,因此硒钌锰薄膜中振荡的起源仍然难以捉摸。在本报告中,我们仔细评估了在残余电阻率比为 RRR = 82 的三维厚 SrRuO$_3$ 薄膜中观察到的量子振荡。我们揭示了两种振荡成分并存的现象,它们都来自二维电子态,而且质量略有不同,这表明不同韦尔点对之间形成的表面费米弧态参与了振荡。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unconventional two-dimensional quantum oscillations in three-dimensional thick SrRuO$_3$ films
SrRuO$_3$ is a prototypical transition metal oxide which hosts rich physical properties including itinerant ferromagnetism, high conductivity, and intrinsic Hall effect originating in the Weyl points. Recently, high-quality SrRuO$_3$ films with residual resistivity ratios of more than 50 have been reported to exhibit quantum oscillations at low temperatures in spite of its strong electron correlation. While the origin of the oscillations has been discussed in relation to Weyl orbits based on the Weyl semimetal band structure, so far experimentally reported results are neither consistent with each other nor with theoretically expected behavior, leaving the origin of the oscillations in SrRuO$_3$ films still elusive. In this report, we have carefully evaluated the quantum oscillations observed in three-dimensional thick SrRuO$_3$ films with a high residual resistivity ratio of RRR = 82. We reveal the coexistence of two oscillation components both derived from two-dimensional electronic states and with slightly different masses, suggesting the involvement of the surface Fermi arc states formed between different Weyl point pairs.
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