f-electron hybridised Fermi surface in magnetic field-induced metallic YbB12
f-electron hybridised Fermi surface in magnetic field-induced metallic YbB12
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DOI：
10.1038/s41535-021-00413-7
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发表时间：
2021-02
影响因子：
5.7
通讯作者：
H. Liu;A. Hickey;M. Hartstein;A. J. Davies;A. Eaton;T. Elvin;E. Polyakov;T. Vu;V. Wichitwechkarn;T. Förster;J. Wosnitza;T. Murphy;N. Shitsevalova;M. Johannes;M. Hatnean;G. Balakrishnan;G. Lonzarich;S. Sebastian
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文献类型：
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作者：
H. Liu;A. Hickey;M. Hartstein;A. J. Davies;A. Eaton;T. Elvin;E. Polyakov;T. Vu;V. Wichitwechkarn;T. Förster;J. Wosnitza;T. Murphy;N. Shitsevalova;M. Johannes;M. Hatnean;G. Balakrishnan;G. Lonzarich;S. Sebastian
最近发现的非常规绝缘体家族（从SmB 6开始）中观察到的费米表面的性质是一个激烈的研究课题。在这里，我们揭示了这个问题，通过访问量子振荡在高磁场诱导的金属制度以上的47 T的YbB 12，我们比较非常规的绝缘制度。在场致金属制度，我们发现突出的量子振荡的电阻率特征的多个频率和沉重的有效质量。绝缘YbB 12与场致金属YbB 12的量子振荡幅度在Lifshitz-Kosevich低温增长中的密切相似性，指出了绝缘YbB 12与间隙中性低能激发的量子振荡的起源。在YbB_（12）的场致金属区，除了在绝缘区和金属区观察到多重费米面片外，还出现了重准粒子有效质量的高频费米面片，从而观察到f电子杂化从非常规绝缘区持续到场致金属区，与在非常规绝缘SmB 6中观察到的未杂交传导电子费米表面形成鲜明对比。因此，我们的研究结果需要一个替代模型的YbB 12，中性的间隙低能量激发，其中f-电子杂化被保留。
The nature of the Fermi surface observed in the recently discovered family of unconventional insulators starting with SmB6is a subject of intense inquiry. Here we shed light on this question by accessing quantum oscillations in the high magnetic field-induced metallic regime above ≈47 T in YbB12, which we compare with the unconventional insulating regime. In the field-induced metallic regime, we find prominent quantum oscillations in the electrical resistivity characterised by multiple frequencies and heavy effective masses. The close similarity in Lifshitz-Kosevich low-temperature growth of quantum oscillation amplitude in insulating YbB12to field-induced metallic YbB12, points to an origin of quantum oscillations in insulating YbB12from in-gap neutral low energy excitations. Higher frequency Fermi surface sheets of heavy quasiparticle effective mass emerge in the field-induced metallic regime of YbB12in addition to multiple heavy Fermi surface sheets observed in both insulating and metallic regimes.f-electron hybridisation is thus observed to persist from the unconventional insulating to the field-induced metallic regime of YbB12, in contrast to the unhybridised conduction electron Fermi surface observed in unconventional insulating SmB6. Our findings thus require an alternative model for YbB12, of neutral in-gap low energy excitations, wherein thef-electron hybridisation is retained.